As an Ivalice fan? The latest 24 man raid is brilliant. Lots of neat minor and major references to Final Fantasy Tactics, Final Fantasy XII and even Vagrant Story.
I'll be running it again with my partner in crime tomorrow evening. I didn't get any loot but I did roll a 99 on one of the orchestrion rolls. I only need the gear for glamour, though. So I'm not in any huge rush.
The fights are all interesting. I'd say Construct 7 is the 'toughest' but that's mostly due to basic math being a complexity for many players.
I'm surprised...I actually have genuine issues working with numbers but managed to complete it...so it was a shame to see so many people failing.