I would say I definitely get around when it comes to lounging-around-in-warm-water-type spas....I thought about it while relaxing in the waters today at Body Blitz, and I have been to six in the past year in various countries (seven if you include BB).
If you've reading reviews, then you are surely aware of the concept -- a circuit of various waters to relax and restore. I would say BB is on the small side, but they control the number of women who are inside at any one time so it never gets uncomfortably packed. The facilities are clean and well maintained and laid out, though the changing room can feel tiny when you have a lot of women in there at once.
My major complaint is that the quiet rule isn't really enforced. Sure, lots of ladies are there with friends and you do want to chat, but sometimes you get bigger groups of women calling out to each other across the pool which kinda ruins the buzz.
However, if you can tune that out, you can seriously enter a state of bliss here.