Bought for my Hoover Windtunnel Anniversary Upright Rack which has been in the family for about 10 years and the straps have never been changed. The vacuum smelled almost like something was burning while it was running, and the exhaust air was very hot (however, the smoke detector never went off. Just hot air). With the belts replaced, it runs much cooler and more efficiently (the brushes spin harder and faster). There was a brief moment where it made a loud noise when shutting down, but I think it had to do with something worse than the seat belts as it hasn't happened since. I have only used it a few times in my small pet. -vacant apartment but will be updated if anything changes. Satisfied so far.
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