This is one of those books where you already know all the information, but it's useful to have it all in one place, in a coherent order (sorta!!).
The mind map technique is great for when you need a structure to help make a difficult decision, or prepare for something nerve racking, although the book advocates its use for virtually everything of course.
The unremitting very 'American' style ("this is the answer to all your problems etc.") has to be ignored, but it's well worth the purchase.
It's easy to read, plus you can probably read the thing in one or two hours. I regard both these things as a bonus in books of this type.