Overall I had a good experience here,
Staff were decent, polite & helpful.
All you need to do is to follow the procedure.
The only problem you may have is that there may be a lot of test takers, so you should get there early. (they have to check them in one by one)
the building opens at 8am. consider that if you reach there late you also have to wait for the elevator.
More to say :
1. There were different rooms for different kinds of exams,
the room I took my test was quiet so I didn't need to use earplugs.
2. The temperature was not cold so in my first break I put my zip up hoodie in the locker, my sweatshirt was more than enough for me. It is subjective but believe scrubs would be cold. ( If you are going to have your step exam here, you are better to bring one extra layer ).
3. The lockers size was not huge, but big enough for my stuff: a backpack and a jacket. Lockers had padlocks & were located in the hallway between entrance and the testing rooms.
4. The Prometric is at 34th floor so If you are going to have a 8hrs long exam, you are better to bring your food and a bottle of water with you.