 I owned this car for two hours.  That's all.  The X3 is a beautiful vehicle with a gorgeous interior.  I especially like the dashboard design, the instrumentation and the interior lighting.  I had been shopping for months for an X3 with the upgraded Harmon Kardon sound system because the base sound system is lousy, especially for a premium vehicle such as the X3.  I found one, a nice '17 model with only 11K miles (the salesman couldn't tell me where the car came from, whether it was traded in or an off-lease, which I found surprising).  I took it for a test drive, then I negotiated a decent price.  During the test drive, I noticed the ride was firm, but it didn't seem overly so.  The X3 comes with either Goodyear or Pirelli tires, and the ones with the Goodyear tires seem to ride a bit smoother, although both brands are run-flat tires since the X3 doesn't come with a spare.  During the time I was signing papers, I was surprised to find out that the warranty is very limited and in fact, they give you a four-page document listing everything that is NOT covered.  That was kind of an eye-opener.  Once I signed all the papers, I spent about 40 minutes with a young man who reviewed all the options and features with me.  It was a bit overwhelming, but I figured with time it would all make sense.  Once I left the lot, the trouble started.  The first thing I noticed was that I felt every crack and bump in the road.  The ride was jarring and uncomfortable.  Then, once I hit about 70MPH on the highway, I heard a whistling sound coming from the area of the sunroof.  Uh-oh.  "Is this why it was traded in so soon", I wondered.  Then, I tried to listen to a song from my iPhone, but it wouldn't play,  I fiddled with every logical option to get it to play, but no luck.  I was miserable, thinking I had made a big mistake trading in my trusty '13 RAV4 for this rough-rider.  Once I got home, I sat in the driveway and wondered what to do.  Would I get used to it or was a making a compromise that would prove difficult to live with?  I decided the latter and promptly returned to the dealership.  Luckily, they had not registered it in my name yet, so after some probing questions from the salesman and the manager, they refunded my deposit, tore up the paperwork and gave me back my RAV4.  I felt relieved and feel that I made the right decision.  My advice is to take the car, any car, for a long test drive before making the decision to buy.  And, if something doesn't seem right, trust your instinct.