I had auprobiert anything. Rolling, stones, electric sharpeners, ... Everything was either too complicated or has not yielded the desired results. Prices were sometimes much higher. This knife sharpener has in my opinion a top price-performance ratio. The knives are really sharp in an instant if you have time figured out how to use. Tip: but not too much, the knife perpendicular pull Certainly with pressure through the vagina. The delivery was also immediately. Strong buy recommendation. Oh yes. Since the amount of material on the rough side is not insignificant, I would do evtl.keine shr expensive knife so.