I think everyone else has just about covered my thoughts. buzz-lightyear in particular seems to have a similar experience to me, he's right its definetly a sit and spin bike, up a rough climb and the maestro soaks it up and lets you pedal away without bobbing. With a 120mm fork they're definetly more about picking your line than ploughing through descents, I intend to try a 140mm as soon as I can justify the cash, everyone whos changed over raves about it, and Giant themselves fit a 140 to the X0.
For my riding currently, I don't feel the need to change it, it's a do it all bike for me, my hardtails been relagated to quick tow path rides and road rides, going out on a proper ride and I take my 09 X2. Lots of folk on the MTBR pics thread are on their second or third Trance, always a good sign that people keep coming back IMO. I'd only change mine if I grew some balls and wanted something a bit burlier.