I had a Chatterbox X2. It wasn't bad but I found the Vox to be worthless and I didn't like all the wires connected to my helmet. When I rode with my wife, she would connect to my helmet unit and I was just never comfortable with it. I came across the Autocomm sale and bought the active-7. First, I hardwired the unit to the bike, so it is under my hump and powered from the bike. Only one lead goes to my helmet. The unit has inputs for a radio, cell phone, passenger and another input.... VOX = Excellent! Sound quality = Excellent! The only issue is that for bike to bike, you have to have a separate radio, which becomes cost prohibitive pretty quickly! I never would have bought the Autocom if it hadn't been half price, but if you can still find one, jump on it! I paid less for the autocom setup (minus the radio) than I did for the X2 when I bought it.
Just my .02