- Performance (50%)7.5/10
- Design (15%)8.0/10
- Ease of Use (35%)6.3/10
- Performance (50%)4.3/10
- Design (15%)9.3/10
- Ease of Use (35%)8.4/10
The SunrisePro wouldn’t be our first choice for a manual sharpener, but when you want sharpness and fast, you can count on it to get the job done. Unfortunately, we can’t say the same about the Chef’sChoice 4643.
The SunrisePro is a compact device with a suction cup for a base, which only works on certain surfaces. It sharpens faster than most despite (or because of?) having only one slot. The maximum sharpness level it can bring your knife to is also on par with multi-stage devices. It does, however, shave off a lot of steel from the knife’s edge, which some may find a deal-breaker.
The Chef’sChoice 4643 sports a much more substantial size and great design. It’s much safer and easier to use than the SunrisePro. The stability it offers remains unmatched by any other pull-through sharpener. Unfortunately, its sharpening discs are a failure: They create a rough edge that simply doesn’t cut it.
So as much as we love the Chef’sChoice’s robust build and design, when there’s a knife to sharpen, we’d rather go with the SunrisePro.
- Sharpening Time to Cut a Lemon (35%)9.6/10
- Maximum Sharpness Achieved (20%)8.0/10
- Edge Smoothness (20%)5.0/10
- Material Retention (25%)6.0/10
- Sharpening Time to Cut a Lemon (35%)1.0/10
- Maximum Sharpness Achieved (20%)6.0/10
- Edge Smoothness (20%)5.2/10
- Material Retention (25%)7.0/10
Sharpening Time to Cut a Lemon
- Sharpening Time: 1 minute 5 seconds
- Cutting Feel: Swift and smooth
The SunrisePro was one of the quickest handheld sharpeners to bring a knife from dullness to a lemon-slicing level of sharpness. It took it only 65 seconds in our tests.
In fact, merely a few swipes on the device were enough for the test knife to become serviceable. That’s 10 - 20 seconds max. Include the time to get this device out of the drawer and set it up, and your whole sharpening session would still take less than 3 minutes. If you’re in a hurry or simply detest spending time doing tedious work, the SunrisePro is no doubt one of your best bets.
- Sharpening Time: 4 minutes
- Cutting Feel: Slightly heavy
The Chef’s Choice took its sweet time to sharpen and was consistently among the slower ones in all our test attempts. It took a whopping 4 minutes to bring the test knife from uselessly blunt to adequately usable on a lemon. Even then, the knife needed a little more force than usual to execute the cut. You’d get better results within the same time using a whetstone.
We wouldn’t count on this one as a convenient sharpener to prep our knife before a cooking session.
Maximum Sharpness Achieved
- Sharpening Time: 6 minutes
- Sharpness Level: 8 (Chicken breast with skin, 1 swipe)
This device sharpens more quickly than most others, but its sharpness plateaued at the same point: the chicken breasts. The cut was not completely effortless; however, in an older version of the test, the knife repeatedly achieved this level with ease. Taking both into account, we gave the device full marks for Level 8.
- Sharpening Time: 6 minutes
- Sharpness Level: 7 (Ripe tomatoes, 1 swipe)
The blade had no trouble slicing its way through a ripe tomato in one swift motion. The chicken breast posed much more difficulty: Its slippery skin made it impossible for the test knife to slice clean-off in one go. Two rather heavy attempts were needed to sever the pieces, so we decided to keep the Sharpness Level at 7 instead of 8-.
This sharpness level should allow your knives to complete most food prep tasks with mild effort, but we usually expect more from a device with such a high price tag. We can’t count the number of sharpeners that cost one half or even one third of its price that can offer a better performance.
- Sharpening Time: 1 minute
- Target Sharpness:
The SunrisePro will shave off steel from your blade and you will see lots of swarf on the device after a heavy sharpening session. That can be disheartening, especially if yours is an expensive knife. The blade aficionados in our team almost fainted at how it completely replaced the knife’s original edge after a few months of use.
However, be gentle, don’t apply too much force, and perhaps you’ll be able to reduce unnecessary loss or at least slow down the process.
- Sharpening Time: 1 minute
- Target Sharpness:
The Chef’s Choice 4643 took off more steel from the test knife than its sharpness suggested, but the amount wasn’t significant. As typical of wheel-type sharpeners, the residue was fine dust rather than coarse shavings, suggesting highly controlled grinding.
With only tungsten blades, it’s no surprise that the SunrisePro doesn’t create the finest edge. The edge is narrow, rough, and toothy, with deep grooves and visible chips. All this suggests sub-par retention, meaning you’ll have to sharpen your knife more often with this device. But given that it takes a little more than a minute to get it sharp, that may not be such a problem.
Also, some users suggest using a honing strop, which we think is a great idea. Of course, that’d increase the costs.
Chef’s Choice advertises ‘two distinct facets set at different angles that form a longer lasting, arch-shaped edge’. The sharpener indeed created what looks like a double edge on our test knife.
Unfortunately, while the secondary edge emerged sharp and convincing, the abrasives’ effects on the primary edge were so subtle they were unrecognizable even under a magnifying lens. The discs on the Honing slot were either too fine to make a difference or were placed at an angle that did not allow contact with the knife edge.
That explains the lack of sharpness on the test knife—the secondary edge helps, but it can only do so much.
- Build Quality (75%)8.0/10
- Grip (25%)8.0/10
- Build Quality (75%)9.0/10
- Grip (25%)10/10
In the Box
- The SunrisePro sharpener
The SunrisePro comes by itself in a simple clamshell package. The instructions are printed on the package.
- Chef’s Choice 4643 AngleSelect Knife Sharpener
- 1 x instruction manual
The Chef’s Choice snugly fits into a plastic blister pack with a user’s guide included (which is also available online). The package can pop open quite easily, so there’s no need to cut it with scissors.
Besides the sharpening techniques, the manual also guides you on how to test the knife’s sharpness, and provides helpful tips to keep your knives in their best condition.
- Length:2.3" (5.8 cm)
- Width:2.3" (5.8 cm)
- Height:2.6" (6.6 cm)
- Weight:2.3 oz (65 g)
At the size of a beef tomato, the SunrisePro would make a perfect on-the-go sharpener. That is if you can find a flat surface for it to stay on.
- Length:9.3" (23.6 cm)
- Width:2.0" (5.1 cm)
- Height:2.8" (7.1 cm)
- Weight:6.6 oz (187 g)
The SunrisePro is a well-built device, even though its affordable price may suggest otherwise. It has a dense, weighty body: the only thing left to be desired is probably the size. Its suction base is also thick and solid — definitely not the flimsy type we see on cheap household appliances.
Not a decorative piece, but it has a nice fit and finish, and is easy on the eye.
Its materials do not scream ‘top-notch quality’, but the Chef’s Choice 4643 benefits greatly from an ergonomic design and robust build. The parts are well reinforced and screw-tightened, though it can be disassembled piece by piece. Finish is near perfect and matches its high price tag.
- Material:ABS plastic
The Sunrise Pro doesn’t have a traditional grip. The locking arm, when pushed down, triggers the suction force at the base, which keeps the device in place while you sharpen your knives. The arm is well-built, though we imagine a bigger one would be more natural to use.
The handle extends and slightly arches itself toward the end, forming an ergonomic crescent-like shape. It’s just about the perfect size, and the coating material feels soft and grippy between the palm and fingers. Unfortunately, the handle isn’t loop-shaped. Otherwise, you’d be able to hang it on a hook to keep it within an arm’s reach.
- Levels of Sharpening:Coarse
- Abrasive:Metal blades
- Mechanism:Pull through
- Sharpening Angle:20 degrees
The Sunrise Pro has the most simple working section among all the devices we tested. It has only one sharpening slot consisting of two metal blades forming a V, attached to a V-shaped plastic supporter.
- Levels of Sharpening:Coarse, Fine
- Abrasive:Diamond-coated disks
- Mechanism:Pull through
- Sharpening Angle:15° & 20°
The Chef’s Choice 4643’s working section features three sharpening slots that are securely fastened into the base and covered in a shiny stainless steel sheet.
Unlike most manual sharpeners with abrasive bars or rods, it’s equipped withdiamond-coated discs. As the blade passes through them, these wheels rotate with each draw, grinding and reshaping the edge.
Slot 1 sharpens Asian knives at a 15-degree angle while Slot 2 sharpens Western knives at 20 degrees.
Interestingly, there’s only one slot for honing (Slot 3) for both types of knives, but the exact grinding angle isn’t mentioned in the manual. We asked the official manufacturer in an email but have so far received no response.
- Feet Type:Suction cup
We have mixed feelings about the base. It’s shockingly good when it works — the silicone absorbs some of the downward pressure from your sharpening, keeping the force steady while also suctioning hard onto the countertop, preventing shaking or slipping. However, it’s rather picky when it comes to the type of surfaces it sticks to.
Tip: If it’s a spotless surface and the suction cup is not working, spreading some water underneath it may sometimes help. We found through testing, however, that this tip can be a little hit or miss.
- Material:Synthetic rubber
- Feet Type:Slip-proof sole (x 4)
With the bottom being a hollow gap instead of a solid whole block, the sharpener is lightweight. However, because the base is wide and the center of gravity low, it maintains its balance very well.
The quartet of rubber feet attached at the base corners do a great job of creating friction and keeping the device in place during sharpening—we feel this is a more economical and effective design than the large pads usually seen in other devices.
Ease of Use
- Slot Arrangement (10%)10/10
- Insertion (20%)7.5/10
- Pulling Through (10%)6.0/10
- Stability on a Clean Surface (40%)6.5/10
- Stability on a Wet and Dirty Surface (20%)3.0/10
- Slot Arrangement (20%)7.0/10
- Insertion (20%)8.5/10
- Pulling Through (10%)8.5/10
- Stability on Clean Surface (40%)9.5/10
- Stability on a Wet and Dirty Surface (10%)7.0/10
The SunrisePro has only one sharpening section with two tungsten carbide blades. It’s placed on top of the device, with two plastic supporters right behind to stabilize it. There’s an arrow and the words ‘Draw this way’ engraved on the working section, so it’s almost impossible to get it wrong.
The sharpener has labeling for the slots’ functions and designated knife types. Depending on the knife you’re sharpening, the intended order goes as 1-3 (for Asian-style knives) or 2-3 ( for European-style knives).
The slot trios share the identical size, width, and depth, so it’s easy to confuse them. We strongly advise you to look at the labeling carefully before sharpening your knives, especially during the first sessions with the device.
While the Western slot can only blunt an Asian knife, putting your standard knife in the Asian slot can destroy the edge beyond the point of repair. We actually had to throw away a test knife trying that out.
On other devices where the working section consists of slots, there are wider openings that guide your blade to the V shape blades down below. The SunrisePro’s protruding sharpening blades that look like a bird’s beak are not supported by those ‘guides’, so knife insertion is slightly more difficult. Our advice is to take your time to place your knife into the middle of the slot. Do not rush or you’ll cut into the plastic frame or risk damaging the delicate edge by knocking it against the tungsten blades.
The Chef’s Choice has rather narrow slot openings, so if you’re in a rush, there’s a chance you’ll misplace the knife and cut the cover instead of inserting it into the slot.
On the bright side, once the knife is at the opening, it’ll be smooth sailing. Because the slots taper downwards and the discs are placed deep below, the knife will slide straight down. Insertion is thus much safer for the knife edge compared to sharpeners with tungsten bars that keep threatening to clash with the edge and cause chipping.
The amount of resistance depends on how much force you assert, but generally, you’ll have to apply quite a bit while sharpening with the SunrisePro. We tried sharpening using only the weight of the test chef’s knife and the movement was so effortless we didn’t feel the device was working.
On the other hand, use too much force and it’ll return almost a serrated edge. Also, the amount of metal you’d see left behind in the working section would be devastating.
Because the slots are deep and run all the way across its width (2 inches), it was relatively easy to keep the knife straight during sharpening to reduce the risk of creating uneven edges.
That being said, there’s some room for the knife to jig sideways; when it does, you will feel a change in the friction as you pull the blade through.
As its discs are placed deep down in the slots, the knife kept nicking into the frame, leaving lots of marks and scratches.
Stability on a Clean Surface
The SunrisePro comes with a silicone suction cup serving as a base and a locking arm to secure it. It’s awesome while it works; on the right surface, the suction cup sticksto the extent that it feels like it’s an extension of the surface.
The tricky part is that it requires a completely flat and smooth surface, such as a spotless glass or marble countertop. Also, the suction wears out after a few minutes. That can be frustrating if you’re binge sharpening your knives, but if you’re only randomly working on one, it’s not going to be a huge problem.
This is one of the rare devices that come without a full base and can still offer excellent stability. Despite being lightweight, the sharpener stayed secure and steady on a spotless kitchen countertop, thanks to its well-proportioned structure. Those with weak wrists or shaky hands will really feel a difference with this design.
Stability on a Wet and Dirty Surface
The SunrisePro’s suction cup is useless on a countertop sprayed with oil and salt. We did give it a 5 because it can be held without wobbling — the cylinder shape and its short figure help. It being very small, however, means that you have to be extra careful not to misplace your knife and cut yourself while sharpening with it.
Moving on to the simulated messy countertop splashed with cooking oil and peppered with salt: The sharpener’s balanced design continued to keep its footing. The base did lose its traction with the contact surface and moved along with the pull, but only occasionally and not to the extent seen on most other sharpeners.