I tested a cat 700XT about a month ago when I was looking around.. Not a horrible machine but I really did not like much about it compared to the 570.. Especially the ergo's.. The 570 guys have chatted a bit about the vibration a rider will feel with a single cyl atv vs a twin.. The cat was brutal in that regard.. Now, this was a 700 but I can't imagine the 500 is any better.. I ran it a few km's on the dealers track and my hands were tingling by the time I parked it.. I really didn't like the vibrations from that machine.. As for the ergo's.. I came off of an 850 Xp Toruing. So my body is used to being spoiled by the narrow seat and larger foot wells afforded to the xp with the sideways mounted engine.. Polaris did almost as good a job narrowing the 570.. I find it to be nearly as comfortable as my xp was.. Between the 3 units you're considering.. The can-am and the polaris are the only two I'd choose.. Don't hold me to it, but I believe the 570 is also the most powerful of the 3 as well if that matters to you.. I know for sure that its got more power than the cat700xt, (the H1 motor not more than the mud pro 700), so its going to be lighting fast compared to the cat 500..