It's a nice place and reasonably priced. It can get crowded during peak hours about like you'd expect. Took my kids a few times last summer. We'll probably get a family membership this summer. Here's a link to the website:
We were there last night. It is a cool place for kids. I agree it is for under 10, older kids will get bored. Looks like it could get crowded really easily, not a lot of space for parents to hang out.