Finally started up 'True Vault Hunter' mode last night, but fell asleep after about an hour. The difference in difficulty is definitely something to note, even when playing co-op. Shaun wasn't kidding.
I really wish you could trade golden keys, though. I'd like to share the wealth with some of you guys. Particularly squeal and -Kev-.
Maybe when you guys hit level 50 you can message me and join my game online and I can open the chest for you, or something.