Nah I haven't. Is it pretty good?
It's ok, might as well give it a try, since you can play for free to level 20.
Star Trek Online has really upped it's game, with more content on the way. Completely free to play, too. F2P has been very good to STO.
Same is true of Lord of the Rings Online, and to a lesser extent, Everquest 2. All F2P.
And if you've never tried Star Wars, The Old Republic, now's your chance. That game just went F2P as well.
I'd really recommend STO, LOTRO, and SWTOR out of those. STO is more about space combat, with limited ground combat missions. SWTOR is just the reverse. LOTRO is for scratching your fantasy itch, should you have one.