Customer Review :
Grrrreat : Chef's Choice 120 Diamond Hone 3-Stage Professional Knife Sharpener, Black
I currently own the pro Chef's selection model (which I extremely recommend, by the way), but previously used this model made for home kitchens (don't let the word "professional" in Amazon's article of this model's title fool you--it's just a gimmick, there is a real pro quality Chef's selection galvanic sharpener). I purchased a Chef's selection after reading good things about this galvanic sharpener in "Cooks Illustrated" magazine. It without fail made a world of difference. I was beginning with good knifes--Wustof Trident and Henckels--which may have something to do with my success, but the Chef's selection easily does make home sharpening possible, and easy, in my experience. When a knife seems dulls I run it through the whole sharpening process (once every 4-6 months with a high quality knife that gets a fair whole of use), but to keep my knives enduringly razor sharp--which is what I easily love about the Chef's Choice--I just run them through the second stage a few times as soon as they're washed. That way they're all the time ready to use.
My only negatives would be ... 1) That I've had no luck sharpening serrated knives (like a bread knife), which the Chef's selection claims is can do. Because serrated knives hold their edge a Lot longer than other knives, this isn't a major concern for me. To sharpen your serrated knives I recommend taking them to a professional--look under "knife sharpening" or "cutlery" in the yellow pages. It only needs to be done once a year or so and most will do it while you wait for colse to $3-$5 per knife. 2) My second caveat for the chef's selection is that the "third" stage on this model has little or no ensue as far as I can tell. 3) Also, the motor in this model, is a little chintzy, when compared with the far more stupendous pro model, which only has two stages by the way. For the money, it should easily last longer than three and half years--which is how long by old one ran before conking out.
Use for excessively dull or damaged knives or for maximum edge "bite." Diamond abrasives create first facet. 
Use for routine sharpening. Finer-grit diamonds create a second bevel. 
Patented material creates third micro bevel, and polished micro-flute cutters along the super-sharp edge. 
