Really well organised allowing you to select your time rather than stand in an enormous queue.
A really good experience with fabulous views, and due to the clear glass screens at the top you got the views outside without the wind effect. So it was really pleasant in the sun. No 'big drop' effect either for us as we aren't very good with height. if you are from the UK you will be getting up early anyway so we had no queues at all. And although you nominally chose a day to visit, you don't have to stick with it, very handy
it has a better view of central park than the Empire State Building and that is all. It's is very commercial. Be aware that the ticket only gets you a time slot to go up and that may be hours from the time that you present the voucher. you may want to have an alternate plans for a couple of hours, MOMA is walking distance.