if you plan on trail riding i would stick with a bigger machine from a suspension stand point. I am 350lbs and ride a 750 Brute Force Kawasaki. my other quad is a 650 Prairie Kawasaki. its a night and day difference in ride. the 4 link in the Brute takes ruts and bumps like any Jeep. the prairie is a strut front and flat axle rear and power slides the corners well but hates deep ruts.
If I had to condemn any quad its the 4x4 Honda(300,450,500). they ride like crap. its a garden tractor without the mower deck. they do alright in mud and around the yard but you would hate it in the trails.
Polaris is the reason I have a new knee. the one lever braking is why I stood it on end on a down hill grade and got packed into a tree( stood up when the front wheels locked up at 5mph). I would never recommend one for that reason alone.