I have 2 - 07 Apex RTXs, my son and I love the sled. Had to revalve the rear shock as I am 275 in B-day suit. Lots of discussion on this site, do a search. Some guys hate the suspension on 07 and newer, 06 was a monoshock w/ coil spring like the Er, Gt and Attak, the 07 has torsion springs. Revalve is a must otherwise they are stiff in the studders and bottom to easy in the rough. I have owned an 06 ER, 06 GT and found them too soft even w/ a revalve although they were a lot better than stock.
Corner to corner this is the quickest Apex, it has the 22T top gear compared to the 24T for the ER/ GT and 23T for the Attak
Curious what kind of deals are out there for new leftovers? I'm selling one with 1900 mi.