The sound quality is awesome, no complaints. My primary objectives were to keep the factory head unit so the Bluetooth and MID functions would still work. I need to keep a useable trunk so this solution worked for my needs!
2011 550xi Carbon Black/Oyster, M-Sport, Premium Package, Technology Package, Electronic Damper Control, Dynamic Drive, Comfort Access, Active Seats, Surround Cameras
2005 X5 Sterling Grey/Truffle Brown, Premium and Cold Weather Package, DICE iPod Kit, Bluetooth, DSP, Comfort seats, Invision DVD Headrests, Valentine V1 hardwired, TomTom GPS