Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worked great... For about four months.

This is the third differnt shower mirror I've purchased over the years. This one, like the other two, worked great for about four months. After that time it became more and more difficult to keep clear and a month or so later was completly "fogged" even without the shower running.For $20 I don't expect much.... However, it would be nice to get at least a year out of these mirrors.