This book is a very good. 
This book provides aqequate information; but there are books that are better.I have to point out a few minor issues in the book.
Page 1:"The Hawai'ian people had no word for religion." _|According to my Hawaiian/English dictionary; ho'omana is the Hawaiian word for religion.
Page 10:"Long spent 54 years researching and experimenting with the teachings." _|the actual number is 52 years; this may be a typo.
Page 10:"All of the variations of the Huna system being taught now are based on the work of... more info