Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Great when it works, but doesn't last long

I have had four PaperPro staplers (three different models). These are wonderful when they work. But all of them have lasted only a few months of very light usage. I thought the first one was a lemon and bought another because it was such a great stapler when it did work. But the others haven't lasted long either. I went and bought their staples, thinking it may be a staple problem, but that didn't work either.Its frustrating because I REALLY love the stapler when it works. But after paying a lot of money for three different models only to have all of them die quickly, I'm done with Paper Pro staplers. Theyy're a heartbreak waiting to happen.