Definitely a must do while in Vegas but expect to feel underwhelmed when leaving.
The views during the day is flat, dry, and pretty boring. However, it's pretty safe to assume spectacular views at night because I am always in awe when I walk the strip at night.
It was pretty slow during the day. No lines or congested pods, just the people in my party. My mother was deathly afraid because she was under the impression that this was a thrill ride, it's not. It's best described as a mobile observation deck. The mobile observation deck lasts approximately 30 minutes so make sure you tinkle prior to entering. And from reading other reviews, looks like you are allowed to bring drinks onboard.
I believe the cost is $25 during the day and $35 at night.
I personally would not return but you definitely have to do it once.