i want to buy my wife an X5 but I really know very little beside the new one we test drove for the cancer drive.....so is the huge sunroof only in the new one or special in other models too?? what kind of features differ in the years? are they much different like the e36 and e46 or are they pretty much the same in all years?? do they have any known problems?? any help would be nice thanks

http://www.x5world.com/forums.html