We purchased tickets online-then you go to a kiosk at the counters and print your own ticket. No lines, no hassle. When it was time to get in line and go through security-no hassle. We thought it might be really crowded once we went to the top, but it wasn't and there were plenty of open spaces to walk around and spend time taking pictures and looking out. It was better than I expected with the crowds. The elevator getting you up to the top was smooth and very fast.