TomG 
2012 BMW X5 Diesel xDrive35d 4dr SUV AWD (3.0L 6cyl Turbodiesel 6A)
An amazing Jack-of-all-Trades car but very complex
 First off, the X5 diesel does everything extremely well - it's comfortable, fast, sporty, and economical (fuel).  The thoughtfulness of the designers is amazing, and the execution is making a nearly 5000lb car feel like it weighs 2000lbs less is something to behold.  Compared to the old E53 body style, the E70 feels like it's carved out of one piece of metal and has attained an overall higher level of refinement.  The main drawback of these is that the complexity of the car adds to the maintenance costs, and that's reflected in the relatively low resale value once the warranty expires.  Overall, the car is solid and built well, but there are a ton of gadgets (e.g. every door is soft-close).  The drivetrain is robust, but expect problems with the CDI fuel injectors (the cowl area at the base of the hood is not sealed correctly and drips water onto #5 & 6), which cost ~$700 each and there are six of them.  The "clean" part of "clean diesel" also is troublesome with expensive repairs to the DPF, SCR active tank, NOx sensors, etc., often required.  Bottom line is I would not own one of these out of warranty if I didn't know how to work on them, but otherwise the tradeoffs are definitely worth it.