Hi,
Yes I went there few years ago back when I was in college(8 years ago).
I went with other college students, 3 other gals and one other guy. We all left from springfield so it was still nice little drive to get there. They had rules that werent so young adult friendly including quotas. They also made us feel like we were going to bring spring break there. They gave no discount either for us. As whole it was bit of an expensive trip for us and we didnt have to much fun. After that we decided to do our trips to nearby Mark Twain National forest which was only 25 minutes away, camp in less used camping areas, and do lots of backcountry hiking. Camp sites were only few dollars a night, and we had a lot of fun.
Now as far as 40 Acres Club, they might be better now than when we werent there since its been about 8 years. I hope its improved.
Michael