Well I have been in Moab for the last couple of days with Myself (09 Teryx), and 3 RZR's (one of those being an S). All I can say is I have a new respect for the RZR. Now don't get me wrong I LOVE my Teryx and really like the Differential lock system... and it fits some of my family!!!! However, I really got liking the RZR and I hate Polaris'.
I like their Clutching system on the RZR... You punch and you are gone. The Teryx takes a little while to engage. Also the shorter wheel base is awesome and doesn't bottom out as easy as my Teryx. I will go to 26 or 27 inch tires when I get back home to have a little more clearance... so when I come back down I won't get high centered as easy.
Can't wait to do the 840 kit and some other stuff.