Do you like Active Battle System FFs? If you do, you'll prolly love this game. The story and atmosphere isn't that great, except from an artistic standpoint. But it's the battle system that SELLS the game. FAST, and loads of customization and options for the girls via the job system.
I've seen it selling for $15 new at lotsa places, BB, CC, and elsewhere. I think it's worth it if you enjoy FFs for the battle systems, story good or not. Plus its fun to run around Spira after you saved the poor bastards from slugzilla, errr... Sin.