I have the n-com basic and bluetooth installed in my helmet. I use the bluetooth to connect to my HTC Touch Pro phone wirelessly to play music. Haven't used it for an actual phone call, dont' really care to.
My friend also has the same setup in his helmet but haven't tried the bike-to-bike comms yet.
Sound quality is less than I'm used to from quality headphones, but for some ambient music while riding it's adequate. The wireless is so convenient, no dangling wires to the ipod or anything.