Jillian Micheal's body revolution challenge

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Hey. Im buying Jillians Micheals body revolution (roughly £110) on friday when i get paid. For those who dont know Jillian is a trainer from the biggest loser tv programme, and this is her set of fitness dvds and diet plan, which you complete for 90 days (3months). its suppost to work really well.

Is there anyone whos completed or tried this? does it work? any advice?