As a professional dog balancer I would like to suggest that instead of relying on the opinions of others you make up your own mind about this book by using a methodology that was suggested by the martial arts master Bruce Lee. He said to "Research your own experience, absorb what is useful, reject what is useless and add what is uniquely your own".
This philopsophy allows you to obtain genuine wisdom and true understanding. As someone who works with dogs that have issues I have found that the "leader of the pack" style as used by both Cesar Millan and Jan Fennel to be the ONLY way to create a real and solid foundation for change. Once you are leader and the dog knows this you will be amazed at how many unwanted behaviours vanish!
Other methods can of course be applied and are effective but if you apply Cesar's methods with an open mind you will create a bond with your dog or dogs that will be the key that opens the door to the kind of relationship you have always wanted!
Buy this great book, use the principles, absorb what works for you, add your own unique touches and discard the rest!