Instruct: Classify Amazon reviews into positive or negative sentiment
Query: For the price, should last a little longer...

This thing works great... for a while. We had no problems with ours for the first year or two. At this point, it's worthless -- doesn't charge any more. If it's a planned obsolescence thing, it makes sense to buy a cheaper one and consider it disposable... Or maybe we just got a bad apple. However, given that a couple of other reviewers have noted similar problems, I suspect that our experience isn't atypical.