 I traded in a lemon 2002 A6 in for the Q7. Within 2 months of the Q7 purchase, the windshield wipers collided during a bad rainstorm on the highway. After 5000 miles the power lift gate stopped working and the back seat wouldn't lock into place. After 19000 miles, the tires needed to be replaced for $1200.  Then at 28000 miles the brake warning light came on, $1700 to replace the brakes and rotors. There was a leak in the sunroof and mold started to grow on the drivers side carpet. Great looking cars, very poor reliability and very expensive to keep up. From now on, I'm spending a little more for another BMW. There is a reason you see many more older BMWs than older Audis on the road.