A best drive opener with a DC motor is extremely quiet and operates smoothly. As others have indicated though, if your rollers are bad you will still have a noisy door.
I had a DC motor belt drive in St Pete Beach for about 8 years. I did have to replace the belt once, and it did show signs of brittle rubber being the issue. The belt did not break, but the rubber knobs on it stripped off. Was fairly easy and cheap to replace. If I were buying a new opener, it would be a belt drive DC unit.
It is possible I had a bad belt to start. Harley Davidson motorcycles have used belt drives with similar construction for years, and have no had significant belt issues. Not sure why a garage door opener would typically have issues as long as the door moves smoothly.
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