I don't know of many people who've tried it. If your skeptical you can get the 12 dollar one and try it. Remember the prices include shipping.
One guy said
"Each time spent $100 dollars, and each time got 40 lbs. Tastes O.K. Seems a little grainy in texture. I make different shakes each time so as not too get bored. I add cocoa powder; other times vanilla extract, bananas, berries and all sort of other stuff even lecithin granules"