Out of curiosity, how difficult is it on one's style of play when moving up stakes? Playing at 2NL I'm trying to create "good" habits whilst doing my best to avoid creating "bad" ones but I know that doing things not profitable higher up is sometimes profitable down here.

So in general I'd like to hear your stories of moving up in stakes. Any shocks to the system? Huge (or smaller) differences which took you unawares? Anything which us lower-stakes players need to keep an eye open for when our bankroll is ready to move up?