I rented the ARV's in Park City with about a foot of heavy, ( for Utah), powder. I'm a 5'-9" 155 lbs advanced skier.
They were a lot of fun. Handled powder and crud pretty good, bumps pretty good, and on the groomers did not shimmy or chatter much at all. They were a bit slow on the groomers but all around I really liked them.
They ski short so buy/rent them longer then you would normally. I skiied 177cm I think, which was fine.