'08 TX2 here...
I don't like the odd rear shock length/stroke. Makes it hard to find a replacement. I tend to ride on the more aggresive side and want something a little beefier than the Fox Float R and have not been able to find something in the same length/stroke. I may just send my shock out to Push (or take a loan on my 401k and get a beefier bike for the gnar stuff).
Another thing I didn't like were the grips, so I switched them out to some ODIs. I also recently replaced the Raceface crankset with FSA Maximus in 170mm length. The shortened length was noticable as I'm not mashing my pedals into obstacles or the ground anymore. Less leverege for climbing though (I don't care), and not big ring (again, I don't care since I didn't use it as much before).
Otherwise, awesome bike. I love it.