I'm one of the people who recommend that book. There are two reasons for reading it:
1) It provides a very different perspective on differently-wired kids. I found it really challenged MY assumptions about what my child was capable of, and the reasons behind the behavior. It includes a great list of potential issues... most of which I'd never even thought about.
2) It provides an approach to working with these kids.
The formalized approach doesn't work for all of us - for some, it really works, others have used bits of it, others found it wasn't for them.
But the shift in mindset, to me, is priceless.
Most people believe that kids do well when they want to.
This author believes kids do well when they can. And... I've come to believe that he is, for the most part, correct. (I won't say it applies to kids with SA issues... that's a different ball of wax!)