Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It does exactly what it is supposed to do

This device DOES sharpen knives like a professional sharpener would. It takes a little practice to sharpen knives using this machine. Yes, a little practice, but NOT a lot of practice. I suggest using cheap knives to practice with until you are comfortable enough to sharpen your good knives. I was not disappointed in this item and highly recommend it. Knives come our razor sharp. Plus the different stages allow you to vary the type of edge you like. Great item. But remember, a little practice goes a long way with this.