Very enjoyable experience.
The whole setup and staff were very professional, no waiting outside, well organised inside, quite a bit of information on the history of the building if you wanted to look at it, movie history was a nice touch and of course the King Kong photo oppurtunity had to be done.
Good internal viewing area and pretty decent outside area as well.
No presssure to move along, could take your time taking in the sights.
Very lucky with the weather, had fantastic views from the observation areas.