Instruct: Classify a review into positive or negative sentiment.
Query: Great at first, 9 months later barely works

This was a fantastic can opener, I even rated it and chastised the other reviewers for being to "picky" Well I have had this can opener for almost a year now, and it hardly works anymore. The blade very frequently does not puncture the can and just scrapes the top of it, I have to jiggle it around to get it to puncture, and once it does, it does not rotate the can.