Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worst vacuum I've ever owned.

After a year, the vacuum started to overheat. Now, it will run for about 45 seconds before overheating and shutting down. I have to wait a good half hour before it will turn on again. The design is awkward and the vacuum is heavy and when it is working, it often spits dirt back onto the floor. Do not buy this vacuum if you want something that even works.