I have the premium sound (DIRAC + 16 speakers) in my M3 and my wife loves it. When we ordered the X3 3.0d (week 20) we optioned it with it. I am looking forward to hearing it in an SUV. I know my system in the M3 is simply awesome. Given the open space in the X3 I would say it will improve the sound stage. It cost $2500 to option and I think it's worth that. The subs unders the seats make a huge difference and you feel it through the seats. Spine-tinggling