A party of 20 and I had complimentary passes to Tryst but weren't allowed to use them. The staff told us that they weren't valid during a holiday weekend (it was New Year's Eve weekend). The passes didn't have fine print stating when they couldn't be used - nor did the promoter tip us off to that! Even with this hiccup, our group had an excellent time.
This is one of my favorite spots to party. The lit waterfall is gorgeous, and there's room to breathe. You don't feel like you're in a meatpacking plant like you do at other Vegas nightclubs. Drinks aren't cheap - this is Vegas, after all - but that's what pregaming is for.
All of the staff were professional, not condescending, and helpful, from the bouncers to the bathroom attendants, to the bartenders. Noy, our super bartender, kept the drinks coming and was funny, too! The MC at the door was receptive to our group's feedback and let the girls (half of our group) in free. Multiple DJs entertained and kept the entire club dancing all night.
Recommended for a fun time.