My friends and I checked out Surrender on the night before Halloween AND on Halloween night last year. This place does get pretty crazy during Halloween weekend; it's really fun to see people's costumes and take pictures with total strangers. And like every club in Vegas, Surrender has its pros and cons.
As for the pros, the place is BEAUTIFUL. It's a mostly outdoor with a small indoor area with a bar near the dance floor and where the pole dancers are. I really like that there are bridges going across the pools (it makes me wonder how many [drunk] people have fallen into the pool while walking across). Like XS, there's some gaming tables inside as well and lots of outdoor breathing room if you wanna take a break from dancing. And if you want a break from the big crowds of XS, Surrender is a great alternative to check out.
And the cons. The dance floor is kinda small but I didn't mind this too much because it gets you walking around to check the whole venue out. It's another club that's getting into the trend of playing house music (which can be a pro and/or a con, depending on if you like/love house music). Also, you know you've been in Surrender too long when they start repeating songs. Drinks are expensive but that comes with the territory of clubbing in Vegas.
I'll definitely be coming back here even though I like to check out a club I've never been to or that's new whenever I'm in town.