I saw it in IMAX 3D last night. I was hoping this would be a film that would warrant 3D format, but I was dissappointed. The film itself is well done and well acted (and I'm not a Sandra Bullock fan), and it's certainly a "big screen" film. I do think it's worth seeing in IMAX if that excites you at all, but I think the 3D was wasted here.
For context, the only film I've seen to date that really took advantage of the 3D format was Avatar. That's it. So, perhaps my expectations are a bit high.
s.i.