That was awesome. I really didn't expect this to be the other side of last week's episode (although I suppose I could have guessed that) and it nicely tied in with it all.
Lots of fun scenes and gags and all the ponies got something to do and show their character. I especially loved Rarity. Twilight learning to be more relaxed about things was a nice touch. Dashie getting obsessed with the Empire getting the games was hilarious to watch.
I appreciated how the writers brought in a character that has issues (claustrophobia) and treated this condition in a respectful yet entertaining way.
I don't care what anyone else says - I like the crystal ponies. After all, they're ponies made out of crystal! - as Rarity put it in the first episode it featured. Plus, it's crystally.