Great views of the city from top but, in my opinion I'd suggest to stick to the 86th floor deck as the height difference is really slight and you still get to see a spectacular view of New York City
Went to 86th around 6pm for a while, then waited sunset on 102nd. It was marvellous even if quite crowded. 102nd has windows, don't expect great shots from up there, but the view is just great.
Less traffic in the evening and on clear days much better with the lights switch on. Safe the extra $20 for the 102nd floor as it will not add much value. The height difference is to little.
Pay the extra money, online, for the express! Lines are crazy long, and express passes all... Just make make sure that you constantly tell people that you have "Express" tickets!
I think this is actually the 102nd floor..? Enclosed and not windy, and the view is not too different from the 86th floor. I'd say visiting the 86th floor is good enough!
Don't spend your money on a useless view. There isn't any difference between the 86th (open air) and this 102nd (non open air). I gave 20$ for nothing.