Anyone have experience with this?

I realize that this is not paranormal persay, however I'm sure the experience could be for some. For the most part it's about meditation.

My question:

Does anyone have experience with Sensory Depravation Tanks? If so, how was it? I have always wanted to do it for meditative purposes and would love to hear any experiences.

Mods, please feel free to move this if you can find a better place.