Avoid Buying at all costs!
The user-interface has gone from awkward to one of the worst I've ever seen in a game. Combat is better in concept but lag prevents it from having any excitement. The new more Star Warsy feel ends with the new into quests as does any satisfaction you'll get from playing this game.
Game balance is gone- you cannot level between 30 and 80 because there is no game contant that gives adequate xp for players that only spend a few hours a week playing.
Characters are now all but locked into a single profession unless youre willing to start over completely from scratch or lucky enough to have gotten a limited-use irreplaceable respec kit.