The people, the itinerary and the meeting location are great and worth the money.
My complaints would be, and this is the reason for the 3 star is the meeting place inside a loud area is not ideal, especially for folks who have never been to New York. If you choose to drive downtown Manhattan you better do your pre-plan and have parking taken care of. I drove around in a pick-up truck for over an hour. The people of Viator was very accommodating to us when we showed up late.