I'm helmet shopping again and this one- the Scorpion EXO 2000- has popped up on my radar. Internet reviews are fabulous however varying opinions are being offered about appropriate head shape for the helmet. Scorpion sez it's for round/oval heads but a number of reviews say it tends to run narrow and undersized. Well, w/my XXL-XXXL size head, I want to make sure it fits. Can anybody offer their opinion on THIS helmet, not other Scorpions as they are made w/different molds than the EXO 2000.