We didn't use the clubs so can't give a review. But I want to mention that when we were there a couple weeks ago (June), all 3 clubs were not open at the same time so you may not have a choice. They were operating on a rotating basis (RPR one week, HR the next week...). So if you are planning on using one, find out the schedule in advance so you can allow for extra travel time if needed. Don't know if it's that way all the time. I never saw more than 2-3 kids if any in there when RPR's was open.
We had planned on leaving our 6yo and 9yo there one night, but ended up just hanging out at the resort. They were initially excited when I told them about the kids club, but from just looking in the windows they didn't want to go. From the window at the RPR club, it looks like it's for "little kids" so ours balked. On the website it says they have video games and stuff for older kids, but not being able to see the cool stuff from the window pretty much killed their first impression.