From my experience, the Cat M chassis sleds (05-09) that I've ridden are much closer in overall feel to the Polaris sleds vs. the Rev.
Having had an '04 Rev HM-X for a couple years, I never did get comfortable on that sled and it never did handle, turn, float, as well as my previous Polaris sleds or the M Cats. Spent a lot of time and money on shocks, removed sway bar, other tweaks and it just never seemed "right" to me. Kinda hard to explain, but never had any confidence in it- except for climbing, definitely was a goat uphill.
Actually went back to an Edge last season from the Rev and way happier. Turns, floats, doesn't trench, more neutral feeling overall, kinda like your favorite pair of shoes, always seems just right. My brother has an '08 IQ, which I'm quite impressed with overall, very light feeling and more like an advanced edge vs. alien like the Rev always seemed.
Have several friends on XP Summits (couple upgraded to XMs this year) and what little seat time I've had on them, way better vs. my Rev experience, especially the 2010 X model (he's actually stuffing a TMotion kit on his 2010 next week, so that will be interesting to see the end result on snow). Until I ended up with the Edge again, was convinced I wanted a XP, but now not so sure.
Love the M Cat engine packages (M1000 plain ridiculous perma grin at all times), especially the newer models without the diamond drive, but to me the chassis and wet weight just aren't advanced enough to go backwards again. The new Cat Pro-Ride, haven't ridden it, but based on looks and other riders inputs, just doesn't seem like a homerun either (at least in near stock form, and if I'm spending close to $10k or more, I don't want to invest more $$$ in aftermarket parts- I want pull n go these days!).
Likely will upgrade after this season and for my $$$, I'll either go with a Pro-RMK (engine "issues" don't scare me off, 2-strokes by nature are not your fathers Buick & I don't put enough total miles on anyway to worry much. Heck I'd prefer to find one in good physical shape needing a top end and do the work myself, know it's done right, and save some $$$) or a 2010-12 XP Summit (SP or X package, most likely ETEC).
If you can't ride one before you buy, I'd say skip the Rev and find a deal on either a 2011 Pro-RMK or X package XP Summit.