I tried on the Fly hemet at Iron Pony. It fit me extremely well for the brief time I had it on. I also tried on a Shoei, but the shape is all wrong for me. I ended up buying a Joe Rocket Hybrid, because of the rounder more standard shape and the fact that it is an HJC, which has historically fit me very well - and it did. I would have gone with the Fly, but the angular shape just wasn't doing it for me. But I think it's pretty darn good in general.
I was checking the shield distortion at the point, for reference. Seems they all have the visors a bit low when flipped and also have some distortion at the point where it contacts the chin bar, but so what. That is where I glance at the speedo and tach so it isn't some major disturbance at this point.
As for glasses, I do make sure the frames fit in helmets before buying the frames. But that won't do jack for glasses you already own. I have read where people are disassembling the cheek pads, trimming foam, and reassembling them with good results both for fit and for glasses.
Ever get lost? You know, that good kind of lost - come to a dirt road intersection and you have no idea where you are or which way to turn? I like when that happens!
Mark - klx678
95 KLX650C w/Vulcan piston bigbore, 90 Zephyr 550