I went last night and really enjoyed it. They did a pretty good job of recreating some of the areas, and the venue is really cool. A few minor issues:
1) It took far too long to get served at the bar, it's stupid to only serve cocktails as each one takes about 5 minutes to make!
2) Although I appreciate people like the acting I wish they hadn't done it during the film, it's really distracting. I wanted to enjoy the film, not watch a low-budget re-enactment.
3) As somebody else said it's not very clear what you're supposed to do. Luckily we walked in to the film before it started but many people missed the beginning. And after the film nobody knew what to do either
4) Perhaps I was 'unlucky' but I didn't wear a costume based on people here saying it was a 50/50 split, but it was more like 99/1 last night, I definitely looked out of place in normal clothes.
But overall I highly recommend it!