I was hoping for more from this book. This is in fact not a book on how to preach without notes. Rather, Koller teaches the reader how to develop a good sermon outline, then he simply tells the reader to memorize that outline. Nevertheless, Koller's thoughts on developing an outline are really valuable, and I will see myself using many of his elements.
The book itself is very logically laid out, making it easy for someone to skim or to reference. The second half of this book is simply a collection of short sermons to read which seem to follow his method.