I've used the Starcom1 system for a year now. Sound quality is excellent. I have rider to pillion, GPS and cellphone tied in (stereo headphones for music are against the law in this state) and it works flawlessly.
I added the helmet jacks in the bodywork, just to make it easier to plug in and there are no annoying pillion cables flapping around when I'm riding solo. I got the proper cables for the GPS and phone right from Starcom1, and have since added a cable for a two-way radio and a PTT button.
Setup is explained very well in the instruction manual that comes with the unit. You'll have to spend a little time playing with volume and squelch settings, so keep that in mind when you consider your mounting location (mine is on top of the left side bag).
The Starcom1 Advanced adds a few nice bells and whistles, but basically performs the same. Don't buy direct from Starcom1 in England! California Sport Touring sells the same setup for a lot less money.
Beautify America - Get a Tattoo!
2002 K1200LT (going, going, GONE)