I got this as an audiobook.
As a Registered Dietitian, I couldn't stand the fact that food (ice cream parties) are suggested as a reward for not using a diaper. Not only rewards and punishments do not work in the long run (I suggest the book Punished by Rewards by Alfie Kohn for the author to read), food in particular is a very, very bad idea. It can create a complex relationship with food in adulthood and kids should not be punished or rewarded with food. Restricting the child's water intake before bedtime, in case that they are thirsty, is also a bad idea.
As a parent, I couldn't get past the manipulation tactics suggested in order eg to get a child to run around naked. I still can't understand why I have to tell my kid that there aren't any clean clothes and that he has to be naked for the day because of that. I am sure I could come up with another idea, without having to lie to him.
I really didn't want to spend my time listening to it and I just returned it. I believe that the practical suggestions do make sense, but how you implement them during the potty training also plays a great role.
Regarding the word pee-pee as mentioned in other comments, yeah, I would prefer another word but if this was the only problem with the book, I wouldn't really mind.
The speed of reading was ok for me, someone is mentioning that it is too slow, but I am not a native English speaker so I really enjoyed the pace. However, mistakes are made during the narration and they aren't corrected and it would be more helpful if the questions that we have to answer during the personality test were numbered, therefore more clear. Again, those are for me minor points and I wouldn't really mind if the book wasn't offering such advice. One star.