I wanted to add this comment on here.
When I bought my bike I bought a QWest with it. OK helmet but it was hot. The airflow was so limited that I could smell the sweat inside the helmet at a constant 70 mph. I decided it needed to go.
Today I purchased a RF 1100. What a difference. At 75+ in clean air, it felt like air conditioning under the helmet. I also noticed something very interesting but makes sense. In the QWest, whenever I took my head out of center, the helmet would push to the side, not very aerodynamic. With the RF 1100, not so. I could turn my head any way I wanted and it didn't get snatched. Also I wear glasses. This aspect really surprised me between these two. With the QWest I always had buffeting, no matter what the windshield was at. With the RF 1100 none. This was noticeable to me because whenever the helmet buffets, my glasses would also. Not the greatest way to instill confidence at speed. The RF 1100 was sooo much better in that aspect.
Was the RF1100 noisier, yes a bit, I would say 10% more so but I will wear earplugs if it helps keep me cool here in FL. 101 on the bikes thermometer on my way home and my head was comfortable.