I think it is a useful book in some respects but does not lend itself to reading intuitively. I think most of us want to be able to use the cards in their own right as a way of looking at issues. The thought of looking up the relevant section in a book for each and every card would fill some with horror.
Having said that, for those learning that is perhaps a starting a point, which we should not overlook. With regards to how accurate it is, I have no idea. Perhaps somebody who has the book and has used it could shed some light?
I would not dismiss anything totally out of hand unless I knew for sure how useful or accurate it has proved. I think the idea and concept were good, but perhaps aimed at a different market in some respects?
I have the book (which is on e-bay at the moment) but the only reason for that is I never used it. I bought it way back (forget how many years ago) but my learning took its own course where I never needed it.
Davina