Then
If you're a Storm fan (er, Halle Berry as Storm fan) then you'll be quite happy with this movie. It's pretty much Ian McKellen, Hugh Jackman and Halle Berry tearing up the scenery. And for us locals, it's pretty much entirely shot in San Francisco.
No spoilers, but don't leave the theatre until after the credits have completely finished. That's all I'm going to say on the subject.