I had a Bell M2 helmet years ago, it was brilliant, hardly any noise, like having ear defenders on, wish I could buy one now. I've got an Arai at the moment which seemed fine in the shop but not so good riding really.
I have a Bell M4R indy...... ....very light; tight; a bit noisy but not draughty; very strong visor but only three visor positions (might attempt to rectify that).........but then it is more a racing car type helmet with a positive 'fully shut' or 'fully open'.
I'm 6'1" and my SS has rear sets and the standard screen. The air blast hits me directly in the chest, but I think I'm designed to fit the SS with the short legs, long body, and long arms so I look like ....
Just to continue on with the hight thing, i am 6 4 and have no problems with mine, but i do (as has been said) have a flip screen which makes a real difference on long journeys.
6' - 4" !!!.............Well, f-me, I thought you were standing on a box or I was standing in a hole........