Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Cat Stop WORKS!

I was skeptical at first, but we installed twoof these in our backyard (urban, phx metro area)no cats...! in fact, we haven't even had toput new batteries in the units, since thecats have been conditioned to stay away(pavolvian respsonse? :-)Recommended, these things *DO* work, no morecat c**p to clean up anymore