I've always been mystified by the ability to sharpen a knife. I just can't do it. Not with bench stones anyway. I picked up a Lansky diamond system on sale for $25 at Academy so I figured I'd give it a try. I've got to say I really like it. My wife has a cheap a$$ set of kitchen knives that I've been practicing on. The edge was so uneven it took me about an hour to profile the chef's knife. Once I got it done with the course and buffed it with the medium and fine stones it is a cutting son of a gun now. I sharpened her paring knife sharp enough to shave my arm dry. I really like this kit. It has given me a sense of accomplishment. I want to get the extra course and extra fine stones to complete the set. The extra course will come in handy for doing the bulk of any reprofiling.