I must first of all admit that i have always been a ski doo guy. But the pro chassis looked very similar. So yesterday we had the chance to take one out for the day. Put on almost 100 miles. I could not believe the power from this 600! I took it everywhere i wanted to go, extreamly nimble! When climbing i could thread needles and pull lines in the trees i would not try with my xp. Although boondocking was a bit tough for me on it, i was so used to my xp. This maching needs very little effort , i had it on its side more times than i care to talk about. My fiancee spent alot of time on it as well. She has been riding a ski doo 600 sdi, this is what she will be buying. She fell in love with the ease of carving on this machine. She was abel to climb, side hill and carve effortless. Now she has to decide wether she wants the 800 or the 600?? We r taking an 800 next weekend for her to try. Cant wait, i will post again. As for me, im thinking 1 more year on the xp, but will definatly consider the pro chassis when its my time.. hope this helps those in limbo.