My father was a butcher, I have his knives and for years I have never been able to sharpen them with the sharpen steel that was his. Nor with the many products claiming to be the best sharpening tools on the market. I am estatic everytime I sharpen my knives with this diamond steel as it only take a few quick strokes and my knives are razor sharp. If you never want to have a dull knife again, you need to purchase this one.