I have done it twice. Once wuth my then 13 yr old, he had no problem and ran ahead of me, once with my husband, who is not athelitic, he made it up fine, you can go slowly as people can pass you if they wish.
I have some issues with height, and i was ok, going up is much easier than going down, dont do that, ( you are allowed to take elevator down) .
You can see out around you, the stairs are completely enclosed and feel solid, but, the " walls" are wire fence like material so you can see out, but its not as bad as it sounds, really..just dont go down. Harder on knees and you have to look down when going down, when going up its esaider to just look up.
If you google you can find actual photos of the stairs, try that.