My friend has - she did it for just over a week I think. She said although it tasted disgusting she saw results (although she was being good in all other aspects). Said she got a total of 10.5 inches loss from belly, arms and thigh.
I was intrigued enough to have a look on line for some but at over a £100 it was out of my price range. Just sticking with the sensible diet and exercise.