Ready to make the purchase of helmet communicators for my modular helmets, let me say that i once used the Collett communicators back in the early 2000 as they were the best at that time, but with all the upgrades and many models that are now available on the market with all the bells and whistles the choices are much harder to make the plunge. The field of units out there I have narrowed down to are the Sena SMH10, Scala Rider G9, Interphone F5, and Chatterbox. I like the blue tooth connections to my phone for the times that signals get blocked by the terrain or the distance between users is greater than the units can handle. Also the battery life and ease of use and pairing units is important, and with a modular helmet the placement of mounting of the unit and mic boom is very important too as most modular helmets also include a sunshade switch that maybe covered by the communicator units. So my question to TY users is which model do you use and are they living up to what you expected? With them costing $250 for Sena SMH10, $500 for Scala G9, $450 for Interphone F5 and $300 for the Chatterbox, as i need to purchase 2 units which the prices listed are for 2 units, I was hoping for some feedback from TY members