I want to pickup a set of the Sony Ericsson HBH-IS800 bluetooth headphones. I only use headphones to workout with and these are small enough to be comfortable while working out. Everything I read says that the volume does not work on the headset or the volume slider on the iPhone. My question is, what volume level does the music playback at? Full level? A moderate level? Also is it likely that Apple will add more support for bluetooth headphones?