btw, they game has not been launched/released yet. It's just early access, think it as late beta.

http://www.swtor.com/community/showthread.php?t=44948

All of you have a good point, that changing AC is like changing class in other MMORPG. But we are not talking about other games here, we are talking about SWTOR and it's kinda different than others that I have experience with, let me show you what I mean. In SWTOR the story/RP part plays a big role, changing class, will change the whole story, but if you change AC, the story stays same. Your playstyle will change, but basic abilities stay the same. So in the end it's very different than changing class. Let me remind you that I am NOT suggesting that you can change your AC whenever you want, but I suggest that you could have the possibility to change it limited times (once or twice). This game is different, the story plays a big role for many players, and I guess not too many out there want to read the same book again and spend time and money for it, just because they chose the wrong option at the beginning of the journey. Real Jedi would be mercifull, Sith wouldn't

I guess it's not possible at the moment, to changed your advanced class. Since the game is very new and people want to try out things, so in my opinion players should have a chance to reset their advanced class choice atleast for once, twice could be better since if you didn't like the new choice, you could still change back. I mainly suggest this because at the start of new game, people really dont know what they are signing into when choosing advanced class, and it's just shame to realise at level 40 that just maybe you should have chosen the other option, consider this and good luck for everyone out there