I saw it at the IMAX at TheTech in San Jose. Well, saw MOST of it. When it got to the ending where Supes dove into the ocean and Lex was boarding his helicopter, the fire alarm went off.
30 minutes and an bunch of angry people later, they issued out refunds and vouchers. The movie was too long anyway... I'm not going back to see it but I'm still interested to know how it ends.