Instruct: Classify a given review as either positive or negative.
Query: Amazing tool

I was on the verge of throwing away my blunt knives. Saw this on lightning deal and decided to try it out. I never expected it to be as easy to use. 3 or 4 runs through the slot and my knives were back to razor sharpness. I am now going to buy more of these as gifts for my friends and family.