WE used this Tour Bus after reading other reviews and although it is a great way to see main parts of NY (if you can get on the top deck), and Tour Guides very informative about various focal points and some very humorous.
We tried to make full use but unfortunately, they are not well trained to give proper and clear instructions about how to get to Statue of Liberty using the circle line. On our last day, we were given different instructions by various BBguides and we lost a lot of time walking back and forth on a hot day between different piers and in the end we didn't get to see the Statue of Liberty. Also, you can't go back up through the same stops/route from Lower Manhattan to Mid Town, and we ended up using their confusing subway system which was very costly too. So we won't be using Big Bus on our next trip to NY.