This place is pretty freaking cool as far as clubs go. I see why my friends adore XS.
I went here last Sunday night with a girlfriend who had never been to Vegas before. We got in pretty quickly via the guest list (no cover,) ran through the indoor area and made a round or two around the pool area. Considering that most clubs I've been to are stuffy and crowded, having a giant outdoor area is a godsend.
We didn't try the drinks or stay long enough to see how crowded it gets after midnight, but it seems like the ideal place to bring a group and buy a bottle or attempt to get a comp. It's also a good place to mingle, because there were quite a few attractive people mixed in with the odd middle-aged women going out of their minds "dancing" between booths.
The pool area is a bit of a hazard. One girl, unfortunately, stepped into the pool on accident in the area that isn't lit, but partially hidden by seat cushions. It's a really cool idea, just not very well executed.
I'll probably be back because my girlfriend adored it. Looking forward to it!