Just wondering what other people's experience has been? I know allot of people are dying to have this and anxiously awaiting for this update alone. My experience since Beta 1 is that Apple is doing a sweet job working on this profile. Each beta update seems to get better and better in regards to bluetooth stereo. Anyhow, Beta 4 has brought the most enhancements. Things that are improved is the ability to launch other apps. while streaming music without interruptions in playback. That's nice at the gym when I am using a workout app. at the same time. Another improvement that I have not seen on any other bluetooth a2dp phone is the play/pause functionality. Usually I have to press play/pause once to activate the AVRCP profile on my headset after pairing and then subsequently I have AVRCP capability. Somehow Apple managed to eliminate that step and the first time I press pause it works. That is incredible seeing how nobody else has gotten rid of that frustration. I mean everybody from Nokia, Sony Ericsson, and Microsoft. Hopefully the forward/rewind functionality comes in the next beta! The other improvement with AVRCP that nobody has done so well is the delay from when I press pause. All the other phones take 1.5 seconds before the music would pause after pressing button on the headset. This latest update Apple did something to shorten it to less than 1/2 a second. Incredible! All of these improvements combined with the UI when using A2dp(like getting rid of the volume bar) and the iPod make the iPhone a hot bluetooth stereo phone. Something tells me these performance improvements are for good reason because Apple has a bluetooth headset stereo in the line-up?