Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This knife sharpener is truly a "diamond"

Formerly we used a manual sharpener. When it no longer worked satisfactorily , we decided to buy an electric one. We read the reviews and decided that the "Chef's Choice 120 Knife Sharpener" was a good fit for us. We followed the advice given in one review to read the instructions before using. It has been very easy to use, and the results are terrific. We now have sharp knives with little effort. We had a fairly new knife, which didn't cut well. After giving it a three-stage sharpening, we use it all the time.We HIGHLY recommend the Chef's Choice 120 Diamond Hone 3-Stage Professional Knife Sharpener.