Really great experience, lots of choices/payment options but watch for certain times when different areas are open. We fully immersed ourselves in the experience, we are a group of 6, 3 couples. There are instructions to follow for the cold and hot pools, you feel totally invigorated after going from one to the other. The outdoor roof spa was disappointing, bit of a walk from the door, it was January and freezing ! and the water was not particularly warm, but great views of the city. The changing rooms were organised and you could lock you belongings away and are given a wrist band, we didn't have any issues with staff or security. It was quiet when we went, around mid morning on a Friday. We walked from the chain bridge and went past the horn that you can blow/shout through :) and the war memorial, which was fantastic. The actual baths shown in the photo were swimming lanes when we visited, at night they would be much more atmospheric. We took our own towels and left them in the changing rooms, you do not need them as you walk around and use the various rooms.