Eighty-eight ways to spot what's wrong with a song, point out pitfalls and supply solutions every measure of the way.
When the authors do address specific songwriting mistakes, they do provide some good information, but there is a definite "The more you know about music theory, the worse you're going to do as a songwriter" attitude...there's a definite bias against formal music training, as if the authors feel the need to defend their own lack of training, and attack it as a negative quality in the songwriting world. (Tip #28 is where they really lose all credibility.) It would be one thing if this was Lennon/McCartney writing this book, or Taupin/Elton John...but the authors themselves have only a couple of minor songwriting credits themselves (one for Patty LaBelle, of which they remind you about on every other page, seemingly.)
The book is not a total waste, but it's certainly not the be-all and end-all in songwriting aides. You'll learn more about songwriting by studying the actual masters than by reading this book.