I picked up this book after the author left some reviews on several books that I have written and I wanted to see some of his work. I live in an area where land is extremely expensive and we are gardening on the roof of our home. Hydroponics sounds very interesting and I had only a basic knowledge of how it works. Because of our rolling blackouts, leaving us less than 2 hours of power per day in winter, the "no power" aspect also has a bit of appeal.
The author offers up his experiences with hydroponics and concludes the book with step-by-step instructions for a DIY hydroponics planter with plenty of illustrating photographs. I do wish that there were some more illustrations in the early part of the book while the overall process was being explained.
While the basic advice given in this book doesn't require power, the author still spent some time discussing lights that he couldn't recommend because of their power consumption.
This book does have a number of spelling and grammar errors. This particularly annoys me as an author, especially when I know how easy it is to make corrections and re-upload. If these sorts of things bother you, you might move on to another book...
The book is a good introduction to simple hydroponics and I don't think there is any other book quite like it in this price range. I came away from reading it with a slightly better idea of what it would take to do some of our own. Overall, if you are curious about the subject and only want to spend $3 pick up this book.