For small kids a nice place for a few hours, especially in the winter to kill a few hours but for that you need a membership to make it worth it.
To pay full price and experience the science centre for a day, I think it would be disappointing. They dont bring any new displays they just recycle old ones and move them around.
For those who are coming here as a tourist extraction...get a city pass dont pay full price. Go to the aquarium instead.