Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sharpens Very Well- But Not Perfect

So far, this sharpener set has worked perfectly on every kitchen knife that I have tried to sharpen. However, I give it 4 stars because it can take a little while to get a sharp edge- even for knives that don't seem so dull. Now, that is to put a razor sharp edge on them, and I am still learning the system. But if you want very sharp knives, try this sharpening system.