I'll be real interested in a review from your new C-4 when you get it. I've been exploring helmets myself. C-4 looked like a great cap with an honest pedigree, I just didn't want to be limited on communicator choices.
I ordered a Shoei Neotek today. It is set up nice to replace all of the interior fabric panels, supposed to flow air well and has been set up for universal communications. I know it is not state of the art, hope I'm not sorry I jumped now.......The proprietary electronics worried me.
'17 GSA - RED - Mine / '17 GSA - White - Hers