I bought the whetstone, after reading only evil on quick sharpener and I did not want to ruin my good twin-knife. At first I was unsure though whether I would manage it with the grinding stone, since I'm not the cleverest man, but after seeing the tip was here to watch a video tutorial on YouTube, I could not believe it me then too. I then practiced first with simpler, older knives - and the cut now better than ever, even hopeless cases that I had already classified as bad buy. My good knives are now as good as new. The newer, high-quality copies I have worked even with the 1000 grain and thus again get pretty sharp. The bamboo dish not only looks really classy, she's also very non-slip and prevents the work greater flooding because it absorbs most of water and grinding sludge.