I've tried it and here's my honest opinion
When I first read about it I thought it sounded awesome. Basically eat what you want, so long as you add this stuff to it...no worried. 'Cept when I finally found it (after about a month of looking) paid the 25$ for it...it tasted crap. Made my food grainy, no matter what I put it with or how I prepared it. It felt like I'd added breadcrums to my food and had an aweful after taste. And worse...it didn't do anything.
Don't mean to sound rude, but don't waste your money...
. . . when the rich wage war . . . it's the poor who die . . .