I've done this quite a bit. It's quite an amazing experience that really grounds you and relaxes you entirely. If you're the type of person that likes to isolate themselves from others, you'll really enjoy the experience.

It's amazing what you can learn just by going into one of those. Wow, that muscle is always flexed all day even when I'm sitting or laying down in bed going to sleep? It takes about 30 minutes until you even are capable of doing that, but once you do it's like unloading a rock that you've been carrying on your back your whole life, without even knowing that rock existed.