A succinct and modern summary of Aristotle's Rhetoric. The author does a great job at retaining the essential elements, whilst stripping back some of the secondary features.
The book helps you internalize the key concepts. The study guide and exercises based around Lincoln's letter were particularly helpful. In addition, Crider adds his own two short chapters on memory and delivery - he notes that while Aristotle declined to go into these in detail, they are important aspects of any rhetorical speech.
One concept that was slightly confusing was the idea of "topics". I decided to take these as simple guidelines for creating arguments. Aristotle's constant defining, enumerating, and dividing of the subject matter creates a strong gravitational pull towards formalism. It is easy to see how the medieval scholastics stripped all the dynamic and living elements from his philosophy.
I'd recommend this book for anyone who wants to understand the basics of rhetoric. As the author notes, this foundation helps with the study and teaching of many other subjects, or it can become an area of study in it's own regard. I would feel confident reading Aristotle's text itself after this - in fact Crider includes a study guide in the appendix for just that purpose.
Whichever direction you take, this book is a useful jumping off point for diving into this rich subject. Enjoy the swim!