Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Rotozip-No good!

I fell for the Rotozip info-commercial. According to the RotoZip commercials, the Rotozip can cut nearly everything and very fast. I'm surprised that they did not show that the Rotozip can do all this on it's own! I tried the Rotozip on plywood... the bit dulled in about 1/20 of the circumference and then just burned the wood and would not cut anymore. I tried several bits and several materials and had similar results. The ONLY thing the Rotozip is useful for is cutting thin plastic or Sheet Rock. Do not purchase it for anything else! I will be returning my purchase. Signed, a very experienced woodworker.