Did this on 7/4/15. Brought the tickets online prior to leaving NYC. You take an elevator to the floor and then get on line. I did the one where you are sitting not lying down. I was petrified and almost backed out a million times, but then I saw kids on the line and thought wth these little kids are doing it i cant chicken out lol.
Anyhow, when you get to the top you are strapped and harnessed in. They open up a gate type thing and you see the entire fremont street.
Is it scary: yes!
Is it worth it: yes!
Just do it its alot of fun! And its very fast so youll blink and miss it