I said it before and I'll say it again, the game runs so smoothly after playing ffrk almost exclusively on my phone. I love that I can load an exploration dungeon before getting on the NYC subway where there's no interner and play as normal. There's no loading at all until you exit the zone.
I'm currently just doing coliseum, raising espers, and making all of my numbers bigger. It's a fun game. I'm really digging the achievements being tied to actual rewards too.