Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent Chain Sharpener

For commercial-like sharpening of chainsaw teeth you can't beat this piece of equipment. It is easy to put together and install either on the wall or a bench. Adjustments are not difficult to make but it does take some time figuring out exactly how to do both sets of teeth. The chain holder has to be moved from 30 degrees on one side to 30 degrees on the other and the chain turned around. The sharpener is really amazing. My neighbors come over regularly now to have me sharpen their saws.Excellent value. It straightens out damage we do to our saws by sharpening them in the field with a rat-tail file.