My brother and sister in law both do this a couple times a year. Make sure you read the instructions carefully before you commit. You have to be careful when weening down your food, and also when starting to eat solid food again so you don't get sick. They say it's awesome and you feel great if you follow it right. I haven't done it yet because i'm too lazy to make the solution every day. You won't have enough energy to work out while you're doing it either. Good luck and be careful.
I have never tried it, but I have heard both success and failure stories regarding this diet. Perhaps there isn't a single diet that is right for everybody. Before you get started on it, you should check with your doctor to determine if it is an appropriate one for you.