So, since this is the second motor driven sharpener that's come up.. let me chime in with my .02. I've got some good friends in metal fabrication, metal focused artwork, and metallurgy. They advise against using a motor driven sharpener due to removing too much material quickly, and toying with the heat temper of the metal. For regular knife maintenance, I find that the KME is very quick and you control exactly how much material is removed by using light pressure and easy strokes. I can sharpen a 12" chef's knife in a couple of minutes without removing a bunch of material. Conversely, if the knife is damaged, I can easy change out my stone to a different grit and make short work of powering through a bad spot on the blade, or even reshaping the blade or changing the degree of grind.
This is my personal experience, and the advice of people who work with metals on a daily basis. The same people that suggested getting my EDC Benchmade knife made of M390 steel. On that note, even though the M390 steel is the best out there for keeping a good finish, and a sharp edge even with regular abuse, Benchmade will not warranty the knife if any motor driven sharpener has been used on the blade.