FYI, Surrender is the same space as Encore Beach Club. The pool is closed but you can still walk around it. I typically frequent EBC and XS out of all of the Wynn Social clubs but you shouldn't sleep on Surrender!
Since we were a group of girls, we were able to get in for free before 12:30am and also received drink vouchers. The ambiance is more chill and casual than XS. Bartenders were nice and the drinks were strong.
I dislike the stage placement because it makes it hard to hear all of the music. Marshmello was DJing and we were able to get up close and personal but it got way too crowded. Overall, they have a pretty good lineup of DJs compared to other clubs so it's worth checking out at least once.