I wouldn't say that they always wear out bearings quicker. We have a a guy at our flying field that has on older OS 91 4-stroke (built even before the Surpass came out) that had somewhere between 400-500 flights on the bearings finally gave out. And then he spend $30 for replacements bearings and it runs like it's a new motor now. I would say he definately got his money's worth on that motor.