I found myself in the same situation last year, from MN and ride MI, buying first mt sled, coming off a crossover, occasional trail riding. I ended up with an assault and a friend ended up with an standard rmk. I've only had 2 rides out west so far (1 last season, 1 this season) but here is what I've noticed. The comp track hooks up really well here in the flat lands and the suspension rocks for banging ditches, trails are a little tuff, it leans in the corners, I just picked up a sway bar off eBay from a pro rmk, although I haven't tried it yet cause there is no snow here. The difference between the 2 sleds in the mountains is minimal I feel the track does trench more, the 5.1 seems to get unstuck easier, but the comp track seemed to hold a side hill better, it wouldn't wash out as much. This year I bought a 5.1 take off form tracks USA and moved the suspesion to the "rmk" hole and we will see how this setup works next week we will be in togwotee. My intention is to swap tracks when I ride the flatlands.