I bought a pair of the Sena 20's before riding out west with my son specifically for the trip. They exceed my expectations by a lot and made the trip very memorable. Very simple to operate, clear as a bell, like sitting in the same car, It worked seamlessly with my iPhone for music, or to make a phone call. Several times I could just ask Siri a question, like directions, hotels at next exit. I am not a tech geek and I'm 62 and I figured it out in no time. Now it has many, many other features that I didn't use or understand, but that's just to say that it's extremely well thought out to accommodate everything out there, i.e. GPS, GoPro's, 20 riders at a time?( I can't imagine that ) and you can program it with an app of course!
Range might not be what they claim but it was never a problem for us as most of the time we were within a half mile of each other. Once we went different ways out of range, and just called and used the phone through the same system.
Often times now, I will call my son in New York and not realize he's on his bike riding somewhere. It's that clear! BTW I have the Schubert C3Pro helmet and chose not to use their proprietary system based on reviews. And from what I gather, any of the Sena models will give you the same clarity, just different features. One of my best purchases.