I hit 24 lastnight with my Sith Assassin and have been having a blast. I'm glad I remade my Sith Juggernaut into a Sith Assassin. I've been having a lot of fun tanking in heroic quests and flashpoints. I absolutely love tanking in this game because it has the old school approach to having to use CC and tactics instead of just zerg and aoe everything to hell like in WoW.
Overall I'm enjoying everything in the game. The combat, crafting questing, and storylines are all fun. Only real gripe I have is the chat system, especially during quest cutscenes. I miss a lot of stuff in chat because the chat window doesn't pop up for me if someone is saying something in chat, general,guild,etc.while I'm in a cutscene. So i have to constantly mouse over the chat system to see if anything was said. I also ope they fix the guild window bug where you cant see who all is online unless you type the guild name into the Who section you use to find people. Other than that the game is fine.