I have experience using the handsfree mic via bluetooth in both an E60 545i and now the E70 X5. I never had any issues with the E60. In comparison, I have found the microphone audio quality in the X5 to be terrible. Background noise is much louder and somehow every bump in the road is amplified through the microphone to the other person on the line. When the vehicle is not moving, the sound quality is actually good. While drving on the highway or on a bumpy road, it is almost unbearable to callers on the other end of the line.

I can't imagine the hardware has changed much from previous models to the E70, so my guess was that some combination of the larger cabin/panoramic sunroof/microphone positioning etc. has introduced a lot of background noise that screws up the sound quality of the mic. I would be interested in others experiences, particularly in comparison to other BMW models.

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2007 X5 4.8i (PCD Feb 2007)
Monaco Blue/Tobacco/Bamboo, Sport w/ 20" wheels, Running Boards, Premium, Technology, Cold Weather, Heated Rear Seats, Premium Sound, Comfort Seats, Comfort Access, Sirius