If you are interested in Pinor Noir and want to know more about its history, winemaking practices, or benchmark producers in North America, you need this book. Period. However, note that it is decidedly *not* a wine guide. It is about the varietal and its history, with selected (and now out of date) coverage of wines and producers.
The book starts with history of PN production in the US and covers winemaking practices in moderate depth. It then profiles a few dozen of the most important producers, describing their history, vineyards, winemaking protocols, and some tasting notes. This is extremely helpful for three audiences: (1) those interested in PN history; (2) those who want to learn about PN winemaking practices; (3) those who want to find the benchmark producers and have an introduction to their style. For instance, I found a small producer I had never heard of, ordered some of their wine, and have become a big fan. But note that the number of producers is small and far from exhaustive -- they are chosen for importance and representiveness -- and the book was published in 2004, meaning that most of the specific wines discussed are from the 1990s and very early 2000s.
How does this book (NAPN) compare to Haeger's later book, "Pacific Pinot Noir" (PPN)? There are three primary differences. First, PPN presupposes that you either know or are uninterested in much of the history and detail available here in NAPN. If you want to substantial detail about the history, the founding producers and their practices, or the winemaking protocols, then this book (NAPN) is the better choice. Second, PPN focuses exclusively on the Pacific region, so the (few) producers elsewhere such as NY State are excluded (but some are included here in NAPN). Third, PPN is somewhat newer and has many, many more producers, so it serves much better as a guide to the wines that are available.
In short, this book has a lot of detail about Pinot Noir, its history, and winemaking in North America. It is getting a bit old but most of the material is still relevant. However, it is neither exhaustive nor up to date, so it is of relatively little use as a wine guide (which is not its purpose). Still, for PN fans, it is an important and interesting read. Cheers!