I rented a stay once at a 'new age' shop one time to try it out.
Was sober though... wanted to experience it straight up.
Was an interesting experience... had a few very relaxing moments but my mind's tendency to go "Oh my, I'm relaxing now!" kept pulling me out of it... seemed itd work best with someone who is really good at meditating.
Near the end I scratched at an itch near my eyebrow and that was a mistake, the water is VERY salty and so it stung my eyes quite a bit.