I've been a cat guy all my life. I ride a 06 M7 currently, but I'm buying a new sled this summer. I was planing on getting a 09 or 10 M8, however I just rode a 2011 polaris pro. The pros just roll up on their side so much easier. And the biggest difference I noticed is if you are sidehilling, and have it rolled into the hill, and you want to turn up the hill, just step back on the running board and give her a little gas, and it will shoot right up. I think the cats take a little more work to get to turn up the hill. I hate to switch to polaris because I've got so many spare parts for the m-series, and my dad will probably kill me, but I think its worth it.