I will start by saying that I did not follow the book to a T, but it provided the basis of structure and routine that I was not previously using in my PL efforts. I found the suggested rewards to be a little extravagant (i.e. a tricycle for self-initiating)--stickers and excited praise worked fine for us. She got a book on her first completely accident-free day. We had a few melt downs in the first couple days, which the book gave me the confidence to muster through. It was much easier on day 3, and by day 5, we had a good groove going. Three weeks later, my just turned two year old is pretty solidly potty trained--the pinnacle of which was a #2 on a public toilet today :) (I know TMI, but parents get it.)
This is not a "when they are ready" method--it's a "when you are ready" technique--and as a cloth diaperer, I was ready to be down with laundry ;) I do not recommend this book for parents that can't bare to see/have made their children cry (it isn't called boot camp for nothing). I highly recommend this book for tougher love types.