We had pre booked our tickets (recommended) for 10:10am and got there a little early, there was already a small queue but it soon built up. The doors opened at 10am, there was some confusion between staff as to when you can enter as the sign says that you can only enter at your allotted time slot, two very officious ladies rebuked us for being 10 mins early but a gentleman then just waived us in.
However, I have to say that the experience starts in the lift/elevator and continues to thrill as you get out onto the deck. The views are unbelievable from every angle and you can go right up to the edge against the glass! The glass floor is magnificent, if a little crowded as a lot of people feel lie on the glass to have their photo taken.
The area around Hudson Tower is up and coming with lots to do and is also where the High Line starts, another must do! An excellent experience.