I bought a package of clay wraps at Lady Di's prior to my wedding to try and shed a few pounds. I was skeptical of the claims of many inches lost, and after 5 trips, I noticed nothing more than a bit of skin tightening and softer skin.
But it is relaxing. You undress to your underware, go in a private room where the girl measures you, then covers you in gauze wraps soaked in a hot water and clay bath. Then they slip you in a plastic suit, sit you down in the rest area and set you up with some water to drink. Twenty minutes later you are unwrapped and measured.
You will lose inches in a session, but if you don't follow an excersize/food regimin regularly, as well as hydrate with TONS of water, you will lose progress by the next time you come in.
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