ap21 works like it should, but its uglier
(i even had to buy the white one)
i dont use it for my sony hbh-ds970 thats STILL waiting for apple to enable a2dp... cause im sure i would brak it in my pocket.
i use it for my car´s a2dp stereo. (wich has handsfree too )
also, my tests are on the 1st gen iphone (firmwares 1.1.3/4 and 2.0 / 2.0.1 )