This book is the technical bible for aspiring helicopter pilots. It is essential reading for pilots studying for either a private or commercial helicopter pilot's license. It goes into more detail than any similar book, and the material is explained in a clear manner. Although the detail is more than would be required to pass a private helicopter license technical exam, the extra information presented is still useful and informative.
To sum up, if you want to to learn to fly a helicopter, read this book. The book won't just help you gain your license - one day it may save your life.