Review on 🔪 Chef'sChoice Electric Knife Sharpener: Diamond Abrasive, 3-Stage, for 15 and 20-Degree Knives, Straight and Serrated Edges - Gray by David Magnus

I would only recommend this sharpener for cheap knives that just need a quick sharpening rather than worrying about scratches on the sides of the blades and small nicks on and off to make the edge of the blade. I have used this to sharpen my expensive Shun Damascus chef's knife and it not only scratches the sides of my blade which have a sort of mirror finish but also leaves small shavings. Blade regardless of my technique! Additionally (and you can see other reviewers saying the same thing) your knife's blade cuts through the bottom plastic of the guides you thread the blade through. This problem will eventually cause the blade height to change, which the sharpener will scrape off your knife over time, lowering the bottom of the rail where your knife cut through (common usage). Again, I can't stress how bad this is for knives that you not only want to keep in good (looking) condition, but also want to prevent the blades from micro-chipping (because they're bound to chipping). Of course we are there for cheap knives. For everything else I would recommend taking the time to shop and learn how to sharpen your expensive blades with whetstones. It has many videos on YouTube.