this has been an ongoing issue for me. i just don't trust the Chef's Choice sharpeners, or rather, i don't trust that i'm using them correctly. it's pretty clear to me that there is a large margin of error as far as putting the blade in at a "correct" angle. it's not as though the device accepts the blade at one angle. so, how do you use this thing? as with any tool, if you don't know how to use it, you run the good chance of messing things up. apparently, there is no "knife sharpener for dummies" device. otherwise, i'd gladly buy it. regards, dull.