I understand that you need the special dongle to get the better bit rate and all that good stuff.
What i'm getting at is that the bluetooth audio is awesome with stock android even with a2dp and factory bluetooth in your car. I'd be willing to bet that my og evo without sense sounds beautiful compared to the new evo in my car. There's no reason why they shouldn't increase the bitpool settings to make the audio sound good from the factory. Now we have to buy a $60 dongle when it already has the capability to sound awesome. Kind of lame in my opinion. If you search for "bluetooth bitpool android" you'll see plenty of threads on different forums of people trying to solve the issue. It hasn't been solved to date other than switching to a non sense rom.
maybe I just dont realize how good it should sound, but the music from phone going thru Bluetooth to my car sounds phenomenal!!!! I bought a new stereo bcuz the stock one didn't have the ability to stream via bt, but this new one uses a2dp and still sounds unbelievable to me and my wife.