I bought this book 2 years ago, shortly after it came out. I geared myself up, and followed the whole 15 days to a tee. I don't know how much weight I lost (don't own a scale), but it did work. I definitely got lighter and tighter, and it was most noticeable after about 7 days in (my tummy was flat!). I didn't keep the weight off forever, but then, I don't eat raw or even super great everyday, so that's to be expected.
What I loved about the book is that there is so much variety. Some people said some of the recipes aren't so great, and I agree, but at least once that one is done, you know you don't have to have it again! And some are so good that I have a hard time not making it every day (Beauty Berry shake, for example). I did find, while trying some of them on and off again after the 15 days, that it's better (for my tastes) to blend the shakes in the high speed blender for a good 1 full minute. That warms them slightly, though, so then I tried making them ahead of time and let them cool down in the fridge for a couple of hours or even overnight. That way they're cold when you drink them. I put them in a glass and just drink them down, and that makes the "worst" of them much more palatable.
There's also variety in the ingredients, but they're all easy for me to find in a big city. Someone mentioned how it was a hassle to have so many ingredients and that they have the same shake every day. Well, you need a variety of vitamins and minerals, and different combinations thereof to be optimally healthy. So this book does do a good job of that!
I'm on my second time following the guide as-is. 3.5 days in and I've already lost weight. Sometimes after dinner I still feel hungry, but never during the day. There's too much to eat! Also, it's really only the first 3 days that I feel that way. Once the solid food kicks in, it's even harder to eat everything on the list, and last time I didn't even end up eating everything.