I joined Skool when it was not even available to the public. Much before Skool games and all the buzz. (I literally met a girl in the cafe in Bali who discovered Skool through someone) I must admit. Skool is one of the best tools out there. Nothing comes close to it when it comes to building an online community.
I spent the last few days testing Circle and Skool and created a crisp comparison: Skool vs Circle. I hope people will find it helpful. Let me know if you have any questions.