I visited about a year ago:
I had a great time! I have to echo @bunkyboar's complaint that many of the exhibits were broken. A handful were just off or otherwise unusable, and several were just in some state of partial disrepair.
Regarding the level at which the exhibits are presented, I have to disagree with the other comments here. I was delighted that the museum went to lengths to give information at multiple levels. Almost all of the exhibits are accompanied by an interactive display with a little Sierpinski triangle on it, and you could touch that icon to delve a level deeper into the mathematics. The first level would be something a parent could explain to a young child; the second would be roughly high school level; the third would be graduate level (group theory, analysis, etc.).