I currently have a 2007 Artic Cat 650H1 which has been great so far , a friend has the same bike but its a 2 up . The share the same motor and running gear . I personally cant comment on the 500cc motor but everything else is pretty much the same .
This is my first automatic bike so the lack of shifting took some gettin used to ,the independent suspension and the ground clearance are two things you'll appreciate as well as the high / low range ,in low this thing crawls .
We're happy with our bikes.
Good luck .
This an all artic site , good info in there
http://www.arcticchat.com/Heres another good site covers all brands
http://www.highlifter.com/