My wife and I are looking into bike-to-bike communications. She has the RT Limited, and I ride a 2005 Goldwing. We had thought about bluetooth sets, but the range is too limited. The CB option does not sound too inviting either. I have friends that have a CB on thier rides and complain that the most distance the can transmitt and be understood is about 1/2 mile. Also in our area at least, there is so much traffic on the CB bands that it is very hard to break in.
The FRS/GMRS radios seem like a better option. There is a guy on the GL1800riders.com forum that manufactures a unit for the goldwing that is plug-and-play and allows the use of either CB or FRS/GMRS with the built in handlebar controls on the wing. It also allows plugging in GPS, Radar detector, and MP3 players. I think it is called "GL2way".
As far as I have been able to find, there is nothing like that available for the Spyder's. We have been talking to a local BMW shop that installs the Autocomm unit on bikes. They claim to have very good luck with this system, but have never done one on a Spyder as of yet.
We haven't taken the Spyder in for an estimate yet, but I'll post here when we do. Until then, I'm very interested in what other's are doing.
Joe in Modesto