This was a great experience even for a native new yorker who grew up in the Bronx. I had instant nostalgia while gazing over lower manhattan, uptown and the outer boroughs. I was fortunate to visit the Twin Towers Observatory Deck and Exterior Rooftop Deck and this experience brought me back to my childhood.
As far as cost, just by the general admission passes while visiting during COVID19. I was compelled to buy the premium passes to avoid crowds during entry, but their was none. Hindsight, the check-in is similar to the TSA checkpoint at an airport, everyone is entering the same checkpoint and elevators...so don't burden yourself with the higher expense for premium tickets. The tour only takes 20 mins and their is also a presentation on the south end that talks about the design of the Tower and adjacent properties.
I will certainly return in the summer to see my city on a clear sunny day!! (Buying GA Admission too!!)