Well, you can have an indy or dealer check it out and have them look at the usual items, control arm bushings etc. I actually found a used '04 X on Bimmerforums and bought it. Loaded, well taken care of, 51k miles with no warranty. $22k. Put in another $1500 to take care of a few issues and it's fine now. Went with an '04 because we already have 4 cars and just needed an SAV once and awhile. Just make sure you feel comfortable when you buy it. If you don't, walk...simple.