I am looking around the net at rider passenger intercoms. Have never owned one before and don't know squat about them. Got bad reviews on some of the earlier Scala's, said sound was bad, had to yell to activate the vox and the vox deactivated too soon and had to yell again to finish. Got a little better reviews on the Scala G4 and some Sena's. Don't know anything about Chatterbox. Appreciate all info on experience with this type equipment and what you would recommend.