I haven't worn an -84 in about fifteen years... can anyone comment on the profile of the -84 versus the SPH-4B/5 and/or HGU-56? I'm thinking in terms of overhead clearance (I'm 6'1").
I've been leaning toward the -56 in terms of a more advanced level of safety, but any dual-visor helmet that makes me fly around with my head tilted toward the center of the aircraft or makes me slouch in my seat will hurt me more in operation than protect me if I stuff up.