waist twisting disc

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Anyone out there ever use one of these? I found one of those things at a salvation army for about $3. Picked it up cause it looked like fun, and it is. but i'd like to get serious about it. anyone know resource/info on a routine?

This is the best I've found online.

best description of how to use/what it does - http://youtu.be/rEFA1bcF_ro

product review - http://docgerrytan.com/2007/02/27/the-waist-twisting-disc-another-gadget-to-help-lose-weight/

any thoughts?