I use the empeg speakers through a line level converter. The empeg pauses and switches to aux whenever the mute line goes high.

I was at some show in san francisco (ctia? cita? something like that) and played with the new parrot for a few minutes and it was nice, seemed to work just how you'd expect. (Side Note: I found the booth by browsing the bluetooth neighborhood on my pocketpc and seeing the parrot bluetooth kit)

The GPS one seems great. I know there was some issue about the GPS not working durring a phone call with some phones, which would be a deal killer for me. Parrot has a bulitin board on their site which is painful to use, but lets you see what problems everyone's having.

Matthew