I cannot recommend this item highly enough. BTW this is for a PURPLE back, not black but as well as it works I wouldn't care if it was pink with yellow polka dots. I have been using the Lansky kit for many years and I am very happy with it. The most time-consuming process is knife sharpening, which requires a HUGE amount of work to "rehabilitate”. While regular stones work very well, it ALWAYS takes them to remove enough material from a large knife for the blade profile to be where it should be. If you've ever sharpened a "foreign knife" that didn't go bad, or reprofiled the blade profile to a finer edge (say, 30* to 20*), it may take a dozen hours of patient sharpening rough stone to get to the right starting point, points to progress with finer grinds. This damn thing gets the job done in a tenth of the time and leaves a surprisingly good edge. This grinder is actually not that aggressive, it doesn't leave tool marks that are too deep. It just works really fast. Once you get the edge taper right it takes very little time to go from 400 to 600 and smaller stones unless you end up with a 2000 grit sapphire stone like I do because I'm amazing love sharp knives. EDIT: Two years later I'm still using this. To be honest I lost the first one and bought another one. I've decided to remake all my 17-blade kitchen knives, and my cheap "Wolfgang Puck" knife set I bought from the Salvation Army seems to be made of steel as hard as a woodpecker's lips . hard hard solid steel. I tried to get to my "starting point" with a coarse stone (red handle), but after about three hours I just ordered another purple diamond sharpening stone. Arrived promptly as always and after an hour of fiddling my chef's knife was the sharpest knife in my house. Start with a diamond sharpener, then stones and finish with a blue sapphire. Insanely sharp.
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