This is a practical guide that's a lot of fun to read. I read it cover-to-cover within a week. The focus is mostly on bunch table grapes and wine grapes, but there is some information on muscadines and grapes for cooking, juice, and raisins. The information on available cultivars is great. Hundreds of cultivars are described, along with their vigour, hardiness, disease susceptibility, and other useful info. The material on grape breeding is fascinating.
Although It's billed as a book on organic growing, the set of lists of organic options is probably the weakest material. We are in the midst of an explosion of organic methods. Rombough tries to be up-to-date, but that means including stuff that's too new to have a track record, and that he hasn't personally used. Also, despite his efforts, there will be yet newer stuff next year that isn't in this book.
On the other hand, his material on cultivation and pruning is excellent and timeless. I've read about 8 sets of instructions about "how to prune grapes" and every other one says "do it this way". That didn't work for me, because I wanted to train my vine over an ornamental arch. This book says "here's the main goal, here are other goals you might have, and here's what you do to meet those various goals. Now I know what I ought to in any situation, including my unusual one.
I also know that I may run into trouble because my growing area is too small, but at least I understand the issues, and should be able to make the best of what I have.
I recommend this book to the backyard grower, the small farmer, the aspiring grape breeder, and anyone who enjoys good horticultural books.