Got an 08 x3si sport. Picked it up last October. So far the headlight washer started leaking, rear spring broke and the ac doesn't work. Never thought of testing the ac when I picked the car up last October.
Going to take in next week and see what CPO covers. to add to Eurostyle's list of known issues, quirky shifting transmission and lifter noise (which worst case requires the cylinder head to be replaced). Not sure if the new generations are any better. If you're looking for a hassle free experience, lease it and return when the warranty runs out.
That said, I still like mine. I fold down the rear seats, throw up the cargo net and there's lots of room for the dog. It tows 3500lbs which is enough for my boat/trailer and gear. Handles great in the snow, is comfortable and has a quiet ride. When shopping I test drove a lot of small SUV's and the only other one I liked was a loaded subaru forester. Had to rule it out because it could only tow 2000lbs. .