I've been here once to actually visit the exhibits at the Science Center and more recently to see an Imax movie. The museum is a great place for kids. There are several interactive exhibits from what I can remember.
As for the Imax movie, we went to see a documentary on pandas. I was surprised at how many people were there since the tickets are a little pricey for a 1 hour documentary. The theater itself doesn't have the most comfortable chairs, but it was ok for a short movie. I wouldn't want to sit in it to see a regular movie, which I think they show on occasion. The movie we saw didn't have many "action" scenes so I don't think the Imax screen added to the experience. But I'd return if they have another documentary that seems particularly interesting.