Hello, I have tried several types of sharpening knives, and even high-end models, I wanted to make a small and useful gift so I bought this model that seemed pretty at all, and especially handy with its suction system (if effective). Upon receipt I wanted to test him for a comparison. TOTAL The surprise was not only the suction system is VERY convenient, but the system is PERFECT for sharpening and gives exceptional sharp knives. I even tested for an old bread knife from my grandmother who was cutting at all, the result is surprising, it looks like a new knife. It's simple, I bought more because I know I will make people happy and for a great price. My conclusion to buy eyes closed.