Several have mentioned the Grizzlies feeling 'tippy'. Go to the Yamaha forum and check out the G.R.O.C. That stands for Grizzly Roll Over Club. My neighbor rolled his down a mountain here not long after I told him about the GROC.
I ride with him and one other guy with a Grizzly. My 500 goes anywhere they do with the 650 and 700.
Polaris has by far the better ride quality. We have traded machines and I didn't care for the way they handled.
2002 Sportsman 500 HO
Warn 25XT + Bumper
25" Grim Reapers
GoldFinger left hand throttle
and other stuff...