When I first scanned the books (I've got "the other one" as well...same title...not confusing at all...), I thought they were annoying. But that was because spawn hadn't reached the correct age yet.
So to start with: for kids aged 5-8 this is a good book to read to them, depending on their respective development. This book specifically addresses "loss of control" and "anger". It teaches how to respond to situations where things don't go the way you imagined, or planned, them. And it teaches that all big emotions aren't all consuming. In a very approachable way. Hats off!