I've put off buying one of these for a long time. I've been interested in the ease and speed of use of this type of sharpener, but held off for fear of a sharpener that might remove too much metal and heat the knife while sharpening it. clic pic Ad copy: The newest breakthrough in sharpening technology, the M130, presents all your sharpening options in one compact appliance. It professionally sharpens, steels or strops all brands and types of knives; straight edge or serrated, kitchen, Asian style, sports and pocket knives in seconds. Three stages make it possible to obtain a "better than factory" edge quickly and effortlessly. Stage 1, using 100% diamond abrasives, sharpens the edge. Stage 2 is a super-hardened miniature steel that develops a shaving sharp edge with ultra-sharp microscopic teeth, providing a superior edge "bite". In stage 3, a revolutionary flexible stropping disk polishes the edge to hair-splitting sharpness. Using these stages in different combinations produces custom edges, suited to a particular cutting task. Built-in, high precision, user friendly elastomeric angle guides guarantee fool-proof sharpening. I'm not about to give up my Spyderco Sharpmaker, because sometimes I like to sharpen by hand and some knive shapes require it. However this sharpener really works well. The first sharpening station, which uses diamond abrasives, will remove a a lot of metal if one isn't careful, however the instructions and a label on the machine clearly instruct that this station is only to be used with dull knives and even then using a pair of draws (two draws on left, two on right). From there one uses either the steeling station #2 or the stropping station #3. The #2 station give the edge a little more bite while the #3 station gives it a nice polished edge. These two stations remove very little metal at all. For maintaining a sharp knife you would just go back to #2 or #3 as the greater cutting action of #1 is more than is needed for maintenance. The best thing about this sharpener is that my wife can now maintain her own kitchen cutlery. She's quite a chef and has two full sets of high quality kitchen knives. I've always maintained them for her, which she appreciates, but it's a pretty big job as there must be a good dozen and a half knives to sharpen. The machine is very easy to use and it delivers on it's promise of making a hairsplitting sharp edge. The cost was $139 and shipping was free.