Let me just start this review by saying that I was a butcher for 10 years and know how to sharpen a knife plus I'm serious about my blades. I just got this and have tried it out on several of my non-special cooking knives. I have to be honest it has left a really nice edge. Now.. nothing beats a good stone, but I have to admit i was impressed..It left a nice edge (shaved my arm) and didn't seem to grind the heck out of the blade. My main concern was that it would damage the knife, but so far using as instructed the knife is fine. The edge is nice and clean... I currently have no complaints.