We weren't sure before we went to NYC which ticket company to use for the attractions tickets.
We wanted a relaxed pace rather than rushing from one attraction to another to justify the ticket price so ended up going for the NY City Pass and are very happy with our choice.
Over 5 days we used our City Pass vouchers for The Rock, MONH, ESB, SOL and Intrepid, using the vouchers was easy at each location, there were queues at most places as there is security checks at each of these but this didn't bother us too much, the longest was SOL which was approx 30 minutes.
With Intrepid you have to pay an additional admission fee discounted approx 6 to visit the Space shuttle.
You may not think it is a lot to do but indeed it is. Great price. Would highly reccommend for anyone on a budget.
This was worth buying for our 8 days in New York. We did save on entry fees and by-passed long ticket queues. However if only in NYC for a few days, it may not be worth it, but it would depend what you wanted to do. In our case we had the time to do most of the sights in the book. Recommend.