This is definitely a book geared toward first time parents, specifically because the suggestions, check lists, processes, etc. are likely self-explanatory to seasoned parents. I don't say this to criticize, but to inform. I got it thinking I would find some new ideas that I hadn't thought of or we had not already incorporated into our nighttime routine. Not really. It is much more labor intensive in its approach than I am ever going to be with bedtime, and since we already incorporate - in some way - the majority of the nighttime routine suggestions, I didn't find it super helpful in that regard.
There is a lot of focus on all manner of issues impeding sleep, most of which did not apply to us, and virtually no focus on our primary problem. Our toddler had a sudden onset of nighttime separation anxiety at 15 months, but once the fear was dealt with it morphed into manipulating us to keep her in our bed. We ultimately tried every strategy we could think of - many of which are outlined in this book - to get her happily back in her bed. When we finally realized that, once all her needs were met, she was both overtired and angry because she wasn't getting her own way, we put her in her bed. She objected loudly the first night, but we were there to comfort & console her, and by the fifth night she was going to bed without incident. Sleeping through the night has never been an issue for her, and wasn't negatively affected by insisting she go back to her own bed. In fact, she is better rested now, and so are we.
While the no-cry approach may work for a lot of situations (and indeed, both of my sons were easy about going to bed), for some kids it just doesn't. I do agree, however, that if there are underlying psychological, medical, physical, or mental issues affecting sleep, you have to get to the root of those problems. In that regard, I think the author has provided some good starting info on dealing with these more serious issues.