I have the X3 now for one year and love the way it handles. It does have a light hesitation, which is rather annoying (automatic transmission). My beef is with the electronics: the in-dash MP3 player is very touchy. My newer MP3 CDs didn't play at all (but they played in another BMW). Now I only get the "CD Check" 1/3 of the time, which means it can't read the CD. I had it looked at but they couldn't find anything wrong with it. Then the telephone function disappeared from my display. Also, the navigation is always off. Sometimes I'm 50 feet in the boonies off the road, and the list goes on.
Love the handling, overall ride, comfy seats, storage.
Electronics: Helloooo! Get the MP3 working, the nav and make it a bit less complicated. Power lift gate would be helpful.