There have been mixed results, but in general, you will not get as good sound quality as if you were to plug in your phone directly into your Aux in port.
When using bluetooth, the music is compressed and sent over to your A2DP bluetooth device. I've had horrible luck with mine (The music had no bass at all). Think I'm going to have to settle for a wired approach :/
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