I moved to a 155 Poo Pro this season and have been having a blast. There are many who say the Cat motor is superior in putting power to the snow, I will have to respectfully disagree. The area I ride and the guys I ride with do nothing but race from morning till sundown, we lake race, hillclimb race, road race. I weigh 220 with my gear on and have yet to be outrun from 0-85 by any other 800 whether it's a powder climb, road race, or hardpack hillclimb race. We ride with one very small statured 160 lbs. fellow on an '09 M8 that hangs in there real close on a hardpack hillclimb. The Pro seems to pull away from the pack when the snow gets deep. The bumpy trail ride does leave a little to be desired, as the pro seems to be a better powder sled than a mogul masher, and the handlebars are way to tall and ridiculously wide for my liking, the bars are the only thing I changed. One other thing that is worth mentioning is the fact that you may get as many 1,500 miles or more on one belt!! If you leave the stock gearing alone you have a sled that does it all very well on a factory clutched sled.