Well i've got a new to me 2002 summit highmark X 800 with a 151" underneath it and my brother took me out to break me in...knocked out about 70 miles or so, most of it wasn't flat, which i was excited about.
Love the machine, climbed some mtns with it i'd never have thought possible with the machines i've drove before. overall it was good, but dang am i ever sore today!!!
in hindsight i woulda brought a camera and i think i'm gonna put some stiffer springs in the back end. skidoo said it was set up for 185lb rider, but me and a jug of gas and some survival gear is well over that. so i'm gonnna beef it up a bit for pulling a sled and my backpack.
good times, good ride. good investment...