Saw it last night and really enjoyed it. Fast-paced, clever, and has some jaw-dropping action sequences that are worth seeing in theatre. Though, I'm not a Star Trek aficionado, and don't have any emotional investment in the canon.
My only regret was that I had to see it in 3D in order to see it in IMAX. Now, there are some moments, namely the action scenes, that really benefitted from the added "dimension", but I fail to understand why I need to be looking at a 3D gimmick in every scene.