Brilliant buy! You save lots of money by purchasing in advance, we had no problems validating or using the tickets.
Fantastic value - we used almost every ticket but ran out of time for the cruises.
I spend 15 days as a lone tourist and managed to use the City Pass efficiently. If you are not in a rush and spending at least 9 days in NYC, this is worth it to buy. Although some museums included in this has a "pay what you wish" option, buying this pass will let you avoid the awkwardness of "being cheap" situations when paying to get in and you also avoid big crowds in pay-what-you-wish days. Do spend one full day for the big museums. And plan well, especially if you're taking other tours that might already include the other attractions here. I used my City Pass for the Circle Line (instead of the Statue of Liberty, because I already booked another tour with it included) and I upgraded to full island cruise for an additional $5. I used it for the Empire State Building and had it upgraded to access the 102nd floor observatory for $20 (a bit much for an upgrade but you'll forget the cost when you get to the top). I used it for the Metropolitan Museum of Art but ran out of a day to use it for The Cloisters (because it was too far uptown, I decided to skip it and just walk around and let serendipity do its thing). I also used it for The Guggenheim instead of Top of the Rock (which was included in another tour I booked). Guggenheim is very do-able in one hour if you're not an art aficionado/scholar wanting to take your sweet time viewing and immersing yourself in each of the exhibits). I just chose to linger to appreciate pieces that was interesting to me, the others, I just did an "overview". I also used it for MoMA. Do not miss MoMA, spend at least 3 hours here. My favourite pieces are the Van Gogh paintings. The American Museum of Natural History, was I think, the most value for money, because one show is already included in the City Pass (either the space show or imax film), as opposed to paying additional bucks for it. If I ever get the chance to go back, I will definitely buy City Pass again, and explore other areas of the museum I didn't get to see.