Was in a dilemma as to whether to do The Rock or Empire State Building. The Rock is a fairly unremarkable building but the advantage over the the Empire State Building is that you can see the Empire State Building from The Rock and not missing anything by not seeing the Rockefeller Building in your panoramic view. (If that's not too confusing!) Were able to book tickets for @ 1hr later and the view is superb. Not too packed to get a good vantage point and staff are courteous and helpful. Would highly recommend.