Great question — answering as the UphillTech team:
It can save you a few bucks, but it's probably not nearly as good a deal for you as they claim (note that there are other similar passes with different offers as well, those should be evaluated separately). The CityPASS folks promise 40% savings, which sounds pretty good, but there are some caveats. Significantly, that two of the included attractions (the Met and the Museum of Natural History) are pay-as-you-wish, and many visitors do not pay the "recommended donation" amounts (the average Met visitor pays $11 , which includes people who pay the full price not knowing about this policy). What you pay is up to you, but it's reasonable to assume CityPASS isn't paying the Met and the Natural...
Full answer by Zach Lipton: https://travel.stackexchange.com/a/68706 (CC BY-SA 3.0).
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