For the last two High Sierra rides, I have been using the Scala Rider Cardo 90x system with my friend Kevin. I think we were the only people using those, nearly everyone else was on a Sena device. This year I want to change out and get a Sena. But which model? They have teased me for half a year with the 30K ($330) and it does not look like it will materialize before September. I was going to get the 20S ($300) and saw that there is a 20S Evo ( also $300) being offered. But sadly OUT OF STOCK for the Evo. It is so frustrating to want an advertised newer model but have to settle for a model that will soon be phased out shortly after purchase. As Fred Flintstone once said: "mumble-grumble-frazzleracking-brizzlegrump"