I performed the recommended software update, and BT reliability was enhanced greatly. It paired easily with my phone (iPhone 4S), and I can control the functions of the music delivery (forward, back, play, pause) with the steering wheel and/or radio controls just fine (with a short delay).
The audio quality over this medium just isn't that great, though. It's highly compressed and not particularly dynamic, especially if you listen to music that has a high dynamic range. While I appreciate that I can stream music over BT, I find that I prefer when the device is plugged in, either through the glove box media plug or the 1/8" stereo plug on the front of the radio.
But that's just me
And, of course, there's still the 40-ish GB HD in the unit, which is still empty at this point. I should really do something about that!