It's an expository review, and a well-organized one. The writing is lucid, and, to the best of my knowledge, both careful and accurate in its summaries and interpretations.
Hemispheric asymmetries exist and influence behavior.
We have one brain, not two. Other species have asymmetries, too. Individuals differ in asymmetry. The book rewards reading by students from a variety of disciplines. The connections it carefully maps out include those to visual processing, affect, developmental aspects of behavior, sex, psychopathology, dyslexia, functional anatomy, motor performance, and much more.