I was in the back seat of my father's friend's X5 3.0 w/Sport Package and I must say, I had a really bad time. The room back there was tighter than expected, but what really bothered me was the ride quality. I have sat in the front of that particular X5 3.0 and in the front of an X5 4.4i w/Sport Pacakge, and the ride was very acceptable...taut, yet absorbed the rough roads well. But sitting in the back was like riding in a school bus! I was going up and down like crazy, feeling all the vibrations and changes in the road, and it was just the harshest ride I have ever experienced. What gives???