I am fanatical about sharp knives and have tried so many different knife sharpeners with varying degrees of success. I am delighted to say that this product is very good. My knives are sharp and it doesn't damage them whilst sharpening. The only drawback is that you have to soak the stone for five minutes or so prior to using it so I just sharpen all my knives when I use it. It also comes in a nice wooden box so it stores well. I would recommend using a damp cloth or non stick mat under it while using it, otherwise it slips. Highly recommended.
I would recommend this product to a friend.