This book is a must for ashtanga practitioners, having been written by the guru of this form of yoga, Sri K Pattabhi Jois. The forward by Eddie Stern provides an interesting background of the life of Pattabhi Jois and how he came to teach western students.
The opening chapter describes what is meant by 'ashtanga' (eight limbs) of yoga, with valuable information regarding yogic philosophy, lifestyle and dietary concerns, quoting from the ancient texts.
Following is a detailed description of the vinyasa/asana practice.
Ashtanga is a challenging and methodical practice of yoga, with emphasis on correct method; from the first sun salutation to the final resting position, there is exact placement of the gaze, the timing of the breath, and sequence of movement.
Those with an interest in yoga generally, or who practice a different form, may also find this book of value, since yoga is yoga and the ultimate "goal" is the same. It is my feeling, however, that without an existing practice and enthusiasm for this method, the book may seem a little dry in the last section.
I have had a copy with me for years, it is an invaluable reference.