Tried one but I didn't last 15 minutes because I couldn't get comfortable. It's hard to find a good position when the saltwater is burning your crotch, and the the only floatie they give you is half a pool noodle. Plus it didn't help that the chamber didn't actually get dark enough. Who the hell thought it would be a good idea to make it out of white plastic and stick it in a room with windows and a light that doesn't turn off? It was impossible to get it completely dark.

Thankfully the spa employee was understanding and gave me a refund. But if you're a resort who is going to advertise a sensory deprivation chamber as part of your spa package, you should at least do it right.