Have the Collett communicators, as well. Have had them for a few years now. Love that if you are riding in an area that has equipped their groomers with beacons, you know there is a groomer coming up at least a mile before you happen upon him. It really allows you lots of time to get out of his way and let him do his job.
I, also, love that I can listen to my iPod through the speakers.
I tried to get my husband to use our second communicator. One ride of "Where do you want to stop and eat?", "I don't care. Where do you want to stop.", "I don't care, where do you want to go?", and he was tearing it off his helmet and tossing it on the side of the trail. Once I caught up to him, I asked him in my sweetest voice, "Honey, what's wrong?" His reply was, "I have to listen to you all the way up here in the truck. I shouldn't have to listen to you on the trail, too!!!".