Bought one this summer. Haven't done too many jumps with it but I've tried it in headdown/angle/standup etc and it hasn't failed me. The big breathing hole does let in a lot of air in some angles but on the other hand it hasn't fogged up on me. Guess you could tape it if it turns out to be a problem.
Like it better than the G3 which I never could quite get used to for some reason.