Go early to avoid the lunch time queues.
You can use the self-serve payment machines which are the same price as pre-booking.
Chat with the staff on the roof as they are knowledgeable about NY and the view.
I have been using it now for 3 months and it saves me so much research. Reduces the need to call and double check every time.
How did I not know these places existed?! Atly's scoring is a lifesaver, now I can finally find THE spot without wasting time Googling my life away.