I just posted a response somewhere else today about kids clubs too. We just used the Sandcastle Club at the Beach Club resort and it was really nice.
We wanted to have a night out walking the World Showcase at Epcot and that's the reason we picked Sandcastle. It is such an easy walk from the resort over, really pleasant.
My girls absolutely loved it there. Its a very nice setup, many things to do for all ages. There's a separate area with small couches for the kids to watch tv. Then a large area filled with all sorts of "activity spots" like coloring, small toys such as ponies and potato heads, a kids play kitchen, video games on both computers and actual arcade games - they just had so much fun.
The staff was very nice, asked all sorts of information from us, gave us a pager and the number there, checked for allergies, etc.
It does include dinner for them and they had probably 6 or 7 dinners they could choose from. It is $10 per hour per child...we figured we would have paid that much just to feed them dinner that night somewhere else. We stayed out three hours so it was $60 total. Had they stayed until 10 pm they would have served them cookies and milk too but they gave those to my girls to go.
My two didn't want to leave and begged us to go somewhere for a longer time! So in my book that's a good time for them. It was nice time out for us to explore at our pace and they really needed that down time to relax like they would at home. So it worked out great for all of us.