After several sets of 705's, which I liked and rode up to AK, Dempster, Dalton, Interstates for hours at 90, whatever. I now have an 804 front with a waning 705 rear. When it's done I'll get an 805 and likely never own another 705. The 804/5 are just better. I don't track mileage, I don't care, so I can't speak to that. When they're done, I ride em a little more and then get another. If you're OHV bound, you'll like em more. As far as vibration goes: I used to notice it on the 705 front, I don't notice it on the 804.