If you read old posts about 2007/2008 X5s, you will see a lot of complaints about rough transmissions, jerky shifting and the transmission holding gears and really letting the rpm go up, without a needed shift.

MANY software updates were provided by BMW, but none seemed to work. It seems the new transmission in the late 2010 and 2011 models solved the problem!

My 2008 4.8i had the worst transmission I have ever owned. Seriously, my M3 with SMG II was smoother (and that thing was a beast)!