A couple of notes:
We got flashed on a speed camera in a tunnel in Germany. I am expecting a 15kph over limit ticket, but oh well. The cameras were in a lot of tunnels in Germany.
The peppy X1 was eager to exceed the 100mph and 4500rpm limit during break-in, but we did our best to follow that guideline on the autobahn. 100mph cruising was super smooth though, and no excessive noise was noted even with run flats and panoramic moonroof with the fabric cover rolled back.
The regular seats were comfortable for us at 5'8" and 5' for me and my wife. I only felt a minor bit of discomfort at the end of a 6 hour straight haul from Nice to Futuroscope, but that happens to me after that long in any car.
3 full size suit cases could fit snug in the cargo area, hidden from view by the rear deck. I was worried about cargo space if we had another couple join us for the trip, but there would definitely have been sufficient space.
Harmon Kardon stereo is a necessity for audiophiles who don't want aftermarket sound upgrades. We had only heard the basic sound system at local dealers, but when we got out car it was noticeably clearer sound with very decent bass/mids/highs.
Any other X1 specific questions you guys have, I'd be happy to answer since I played with all the gadgets inside.