I've only been able to go to the Serendipity in NYC once (because I didn't want to wait). Since I was planning my BFF's bachelorette party in Vegas, I decided Serendipity would fit the bill for a nice, casual dinner. Luckily, they did take reservations for a large group.
Walking inside, the restaurant is SO MUCH BIGGER than the one in NYC, which is such a definite plus. I was feeling slightly claustrophobic when I was in NYC. The atmosphere is a bit different; its bigger and brighter, but then again, its Vegas. It's always bigger in Vegas.
We all enjoyed our food, and unfortunately I didn't get a frozen hot chocolate because I was too full from my burger. However, I did have a bite of all the different desserts and they were yummy.
This place obviously holds a bigger attraction for women than it does men. While its not the same sort of experience you would get in NYC, its the same food for a much less wait.