Very worth it!!
Helps you reframe your child's quirks from negative to positive--instead of being bullheaded or stubborn, you can chose to see how focused and determined your child is. And how that will serve him/her later in life.
She does a wonderful job conveying how important it is to keep our kids' innate personalities intact--how to not break their spirits. And also allows how damn hard it can be along the way.
Not sure if it was that book, or not....but thinking about how Robin Williams' mother must have felt during the toddler years makes me feel lots better.
Also good stuff about introverts and extroverts.
You will likely see how spirited you and/or your partner is, too.