FFXIV: ARR is different in that you are able to switch your class. You pick your race, pick your class and then play the rest of the game with those choices. Many MMO games lock you into the choices you make at the beginning of the game. One of the best parts about Final Fantasy XIV: A Realm Reborn is the class system. If you never played or purchased the original, you can pick up this new title as if it were an entirely new product, because really, it is 95% new.
People who own the original version can simply download a large update for their version of the game to gain access to FFXIV: ARR. If you picked up the original and were let down, it is highly suggested you give the game a second chance. The questing structure was completely reworked and the game has basically evolved into an entirely new beast. Classes, Jobs, Locations and everything else has seen some work done.
The first question nearly everyone asks about this game is 'How has it changed since the original version?' Well the answer is that nearly everything has been changed.
