First, if you are not a member at an ASTC member museum, you are wasting a lot of money and time. You'll get your money back pretty much the second time you use it at your local museum or an ASTC member museum in another city, like Carnegie Science Center.
Second, this place is excellent. There are five stories of exhibits for adults and kids to explore. Some of the exhibits are too complex for our 6 and 8 year olds, but they didn't care and still took a crack at them. The best learning/education is when the kids don't think they are learning because they are having so much fun. This place does that.
The Sportworks building next door is very, very impressive and unique. We have the ASTC pass and have been to countless museums and science centers in many cities and have seen nothing like this. There are many sport-centric interactive exhibits - baseball throwing, roller coaster ride, etc. My kids absolutely loved this.
We got here at 9:50am on a Sunday - 10 minutes before it opened - and there were very few people in both buildings. As we were leaving at 1pm, more people had come in but it was still fairly empty. I recommend getting there early so there's basically no wait at the exhibits.