Can't wait to hear how you get on with them. As someone else said - be interested to know whether they push everything up (creating the old 'muffin-top') or just squash it all in.
You said you got them on ebay - did you have to bid for them or did you just buy them from a company (sorry to seem a bit 'dim', but never used ebay so not sure how it works )
Anyway, good luck with them - let us all know what you think.
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If you read that chocolate's bad for you - then it's time to give up reading!