I just got back from this myself and it was a treat. I loved seeing the new fx on the big screen, and frankly, I hadn't realized how much I've realized seeing the Enterprise on the big screen until now.
One annoying thing. Three of the guys behind me were not fans of the new CG effects, and that's fine - but every single time one came on they had to make a comment. I had to shush them. You can have your opinion, but I paid money to see this, don't ruin other people's experiences because you can't stay quiet during a movie.