My G/F and I have had a set of these for about 18 months. Prior to that we used Sena SMH-5's which work great but are getting a bit long in the tooth along with our helmets. She tried on a bunch of helmets and liked the way this one fit, so we purchased a pair so we'd match. They are a $100 helmet (DOT Only) and a $100 communications system combined. The quality of the build could be better. The screw fell out and one of the locking devices and piviot points (I think it was the left side) for the visor broke within the first month of owning it. I was able to get another set from Sena but that was more difficult than it should have been. The same screw fell out of my G/F's helmet but the helmet was not damaged. I just had to put the screw back in and tighten it. I did the other side while I was at it. The locking device that locks the modular front up also no longer locks it in place. They use Bluetooth 3.0 which gives us the same functionality as the SMH-5's with the addition of FM radio but the inability to use it while charging and the loss of "Universal Intercom" which allows pairing to another brands (non-Sena) of Bluetooth headsets. I use my old helmet and SMH-5's to connect to my friend's LEXIN system. I also own a Cardo Paktalk Bold for when I ride with friends that use thoses. We ride all year around and are looking for replacements, That might take us another 18 months before we pull that trigger.
Using the Outrush (No "R") helmets you are able to connect up to 3 other Sena helmet via bluetooth. You can connect to 3 but only talk to one at a time. You can switch between them by tapping the jog wheel one to three times depending on which channel they are connected to you. 90% of my ridng is solo, with my G/F either on her bike or as my pillion, or with a friend on their bike. When I ride in a group, no one seems to really want to connect with anyone else anyway so the riders with the newer systems with the "Group" ability are never used that way.