I received my new C3 Pro back from Sierra Electronics on Thursday last week (had them drill and install the J&M 787 head set) and went for an 180 mi ride on Saturday, all I can say is that I'm very pleased with the helmet and the J&M headset. This is my first Schuberth helmet and the fit and finish are great and the top vent when open allows air circulation inside that can be felt and works well, there is only one little caveat for me and that is while closing the chin part of the helmet I have to make sure the mike and exposed arm (from the headset) is pushed up and in while pulling out slightly on the side of the fixed portion of the chin curtain where it meets with the mating portion of the main part of helmet so that it mike is in correct space inside the helmet and then once closed and locked I push the mike out so as not touching my lips. I had to remove the foam cover on the mike due to there is very little room when closed even though I had the smaller foam cover on the mike, I'm sure this is something that will break in or that I will have to get use to, but in general the helmet will be a keeper.
I was impressed with the sound thru the new 787 headset speakers, bass and clarity are very good, I don't remember the previous J&M headsets that I've had sounding this well, but it has been awhile since I used them, I'm sure the design of the helmet is a contributor, I currently have been wearing a Nolan N-43 modular helmet utilizing the N-Com system that would plug directly into the Harley and I didn't realize what I was missing in regards to sound.
All that being said in my brief test review, I'm waiting on receipt of a new Schuberth M1 for the warmer months.