I came to pittsburgh for the weekend and this was the point of destination.
I don't even feel the need to make a review because this museum should get 5 stars all around!
Entry is $20. There is a cafe on the main floor. It's 7 stories high. They suggest you start from the top and end at the bottom. It starts from the latest to earliest pieces. Each floor is a completely different feel.
There is one room in particular ( on the 5th floor I believe ) where there are huge grey balloons that float around the room freely. It's awesome! I think they offer yoga in the room. There were mats on the floor when I was in there.
There is something for everyone here. It's in a beautiful part of town.