I personally don't like BB, so looked to see if others made similar devices . . . everything I read pointed to this BB device.
Sound quality is very subjective - unless one has a very keen ear, one may not notice the difference - i.e. spend money on audio to match your hearing ability.
For talk shows, news programs and podcast I can barely tell the difference between using this BB device and plugging the iPhone straight into the audio jack. Sound quality is impacted more by poor cell coverage than by this device.
I don't know how well this BB Gateway compares to the built-in A2DP in newer cars . . . if I get a loaner that has A2DP I will report back.