1. Not really
2. Not a factor for me
3. Doesn't bother me either way.
For me, comfort is more important than anything else- even though I play ECB prem cricket against some quick bowlers I'm confident enough that most reasonable helmets will help me avoid disaster (as my old style Arytek did). In the past I have searched for old style Masuri's and old style Aryteks to find the lightest, most comfortable helmet possible. However, I'd never ware an old plastic Albion, thats where I draw the line, they are just too dangerous.