IMO Keith Spicer does not write well. WAY too much waffle in the first chapter or two -- which is why it has taken me 20 or so years to read his book thru.
Lately, I decided to plug away at it, with a view to either a) using his ideas to improve my own presentation skills, or b) selling the book for whatever I could get for it. You see, I have too many books, and not enough time...
It's actually got good material in it, but you must dig for it. Purely by coincidence, many of his findings are identical to my own, independently "discovered" thru the course of my own experiences as a public speaker. I wish I had read his book 20 years ago, it would have saved me HEAPS of time and effort!
(Why, o WHY, Keith, did you make the first couple chapters so full of waffle? WHY??? I put your book down, back then, out of sheer boredom. I shouldn't have!)
Ok, so Keith's book is well worth reading. Persist with it: after the first few chapters it sorta starts to make sense.