This is truly a great tour. I booked this as soon as I landed in NY. Its a 7hr tour by foot (please have your walking heads on!), but it provided me with all the visits to the main sights of New York. The benefit of this tour over bus tours is that you get the subway, and therefore don't get stuck in traffic. Your really get a good feel of the places and the main landmarks. This tour set me up for the remaining days in NY, as it gave me my bearings of the place. In this tour, you will not be going INSIDE any of the main paid attractions, apart from Grand Central and the WTC Observatory (if included in the package), but I went inside all the attractions myself the following days.
Our tour guide was Ian Fairlee, who was extremely helpful, and full of energy. THIS TOUR IS WORTH EVERY PENNY!