I tried it and hated it.
It's funny, no more wow killers these days, the era of big MMO's is coming to an end with WoW and FF14 the last "bastions" of big MMO's.
Granted, I don't believe either game will truly die, or anytime soon. WoW and FF14 are both full steam ahead and still both very popular.
SWTOR did have an xpac recently, I even got back into it a bit, I always loved SWTOR's story, their endgame was crap tho.