I have installed both (Chamberline make) and the belt drives are definitely much quieter. Also, these are self adjusting as there is a tension spring in the belt assembly, this avoids having the belt too loose or too tight. The instructions are very clear on how this is setup. I agree with many of the above comments, and really like the belt drive units.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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