Compared to my vert? The rear legroom was a'ight. I'm sure the 135 is tight back there, I didn't notice. My daughter rode in the back of the 335is and it looked a little roomier than the vert. The 550GT had crazy legroom. We looked like Hannah Montana had hired Billy Ray Cyrus to drive the limo. I'd need a wig for the full effect.
Seriously, that 550 was fun to drive. I don't know why more people didn't try it. 400hp turbo'd V8. I wanted to try the diesel X5 too, but didn't have time.