This book puts together a lot of good research on the topic of not only nasal irrigation but also the general function and anatomy of the nasal region of the head. As a regular practitioner of Jala Neti, I take for granted how easy it is for me so I can't say whether it would be a good guide for learning how to do neti on ones own but for yoga teachers it is extremely useful. This book was able to put together some very useful information for teaching Jala Neti.
This book may also be of interest to physicians looking for ways to introduce patients to SNI (saline nasal irrigation). This is partly because of its more generic or universal presentation. It's more of a "Neti, it's not just for yogis anymore" approach unlike David Frawley's book which is much more thorough in its yogic and ayurvedic treatise. When I got the book I thought it would be redundant with Frawley's book but actually found it to complement the book quite well.
Some of my favorite sections included the sections "anatomy of the nose", "nose blowing and sinusitis", and "yoga cleansing techniques from Hatha Yoga Pradipika".
The anatomy section helped me understand the geography of my head better than any other Neti resource I've come across. Having the anatomy information along with the nose blowing caution helped me understand why you don't want to blow your nose hard. All other neti resources I've read would caution you but did not do a very good job of explaining why. Also, the reference to the Swedish study on humming and sinuses led me to an interesting experience of using "om" to clear my sinuses. Nice!
Finally, his presentation on the yogic applications and references to the Hatha Yoga Pradipika, though brief, were execellent in pointing yogis towards further in depth studies and resources without overwhelming or scaring the non-yogi away from the wonderful practice of Jala Neti.
So in summary, this book is a great reference for yogis, yoga teachers, physicians, and anyone (yogi or not) with nasal and sinus problems. You might also find it useful if you do Jala Neti and have a hard time explaining to your friends why.
Note to people wishing to learn Jala Neti: Finding someone to teach you in person is still the best way to learn Jala Neti with Health & Yoga's instructional video coming in a close second place.
For more information regarding Jala Neti please see my other articles:
Stainless steel Jala Neti pot review & comparison to the ceramic Neti pot
Jala Neti Pot Research Library
Matthew Cox . org
http://matthewcox.org/article.php/the-neti-pot-for-better-health-review