It could be just me. But, I did have one, C-2? Anyways it was a pain in the neck for me, literally on longer rides. I think because of the weight. But, I have to admit it was a well thoughtout design. I got mine at local BMW dealership.
I had a flip up Shurberth with the internal sun shield, which was a feature I liked. The problem I found with the helmet was the lack of internal air flow. It was very hot. I suppose most flip up type helmets are not great in that respect because of the design. I was able to try one on at Helmet Harbor in the Phoenix area. Since then I have had a Arei corsair full face helmet. Out of all the helmet's I have had over the years it is the most comfortable. No break in, comfort right out of the box. Also has outstanding inner ventilation.
Good luck, R.J.:lol: