Mostly what Dan said, mines a 550 with no effort on the ice. If you're getting chains, go for "2 link", they have better coverage. A jump start battery kept warm in a blanket will give you a good boost if needed, don't forget a basic set of cables. Now for the "opinion". Polaris makes some good sleds but their ATV's are a bag of hammers. From personal knowledge, when it gets cold, a lot don't want to start, never mind even turning over. Some of the relays (starter for one)don't like cold and won't work. Some guys have swapped out snowmobile relays which works for some. Fuel injected models work fine, some of the older ones like Honda with a manual choke are good too.