Always wore full face, since my first Bell Star in 1972. Bought a new Shoei 3/4 when I started riding in central Florida in '99 due to the heat, but soon figured out it was not any cooler than a full face modular with shield open and a whole lot less safe. I went down on my face a long time ago, still remember it, had it not been for old full face helmet I would have been a mess, actually wore the helmet chin bar thru while sliding down the road.
Currently we wear Shoei Modular with the integral sun shield and pinlok anti-fog insert and wouldn't consider anything else. Also I ride a bike with fairing/windshield and I see no problem with a full face behind the fairing. And when it starts to rain, I can ride on, no problem