I love Viator. all the excursions I bought from them are very reasonable with great and knowledgeable staff. They are very flexible as well when I made my last minute changed.
The viewing area is quite small, I was expecting it to be bigger which was disappointing.The staff in and outside the elevator were very friendly and enthusiastic.
Great views of the strip, very tight at the top but they seem to keep track of how many people are at the top but still felt a little overcrowded especially when everyone is trying to see the fountains.