I went once and thought it was interesting, but I didn’t hallucinate or anything as some other claim they do with these sensory deprivation tanks. Anyway it was interesting enough that I bought a bunch of vouchers to take friends with, even though it’s not a social activity, since you go into the tank by yourself(thankfully). There was an issue at some point with my vouchers, but the customer service resolved it so 5 stars there as well.