I had the BlueTrip for a few days and the sound had absolutely no bass for me. Other than that, there was absolutely no distortion at high volumes, etc.. but just no bass.
2007 E92 335i
Space Gray, Gray Poplar, Sport, Premium, Navi
HPB Interior, Reverse + License LEDs, LUX H8 V3 Angel Eyes, Powder Coated 189s, Space Gray + Black Kidneys, COBB AP