This book contains a wealth of practical information for the experienced homebrewer, without being dry or stuffy. Thankfully, there are no pages wasted on "brewing for beginners" or "equipment you'll need to get started"; it is assumed the reader already has a basic knowledge of all-grain brewing procedures, and beer appreciation in general.
Discussion of historical and geographic influences on saison and biere de garde are interesting and kept to a minumum. Of particular interest is the text devoted to paragons of both styles- describing their evolutions, specific malts and hops used, abv and attenuation, yeasts, gravities, fermentation temperatures, aging, water profiles, and so on... everything one would need to reverse-engineer a clone beer, if one chose to do so.
It is not, however, a collection of clone recipes. The samples recipes for variations of both styles are intended as guidelines, easily adaptable to individual brewhouse procedures and efficiencies. Also, the parameters are so diverse that it is difficult, if not impossible, to define style guidelines, a fact that the author acknowledges. This loose end can be frustrating to the reader.
Overall, a useful book; solid information, and nothing irrelevant or overtechnical.