Surrender is a great place to go if you're at Encore already, and couldn't get into XS. The lines are not that long, and the ratio is decent. The cover charge was also only $40 when I went at around 11:30pm, but don't let that price fool you into thinking the drinks are also moderately priced. In fact, drinks here are very pricey!
The decor inside Surrender is fantastic and there is a huge pool in the middle that I was very impressed with. Also, the dance floor is pretty neat and is in its own section. Not a lot of people were dancing though, which was disappointing. I wouldn't recommend coming here in a group of single guys though, because all the available girls are at XS.