I purchased this book based on the glowing reviews on Amazon as well as on other piano related sites. The book IS a great concept and appears to be quite comprehensive on first glance.
However, if you are shopping in Europe or are interested in including in your search quality European piano manufacturers (many of which have been around 100-150 years) the book is hopelessly incomplete and, more than once, severely out of date and inaccurate. On the entries for various German brands Mr. Fine keeps repeating phrases such as "no pianos appear in our survey", "I have heard that...", "I played on one once...", "it is difficult to make distinctions" or simply copies text from the advertising brochures of the manufacturers.
The ratings and rankings in the summary section and classification of quality are clearly indicated to be the opinion of Mr. Fine, yet are based on only anecdotal evidence. Worse yet, information on changes in ownership or farming out of manufacturing which has taken place in some instances during the last years -- with an enormous impact on quality -- is not reflected in the rankings.
In summary, this is a great book if you know nothing of pianos and are shopping in the States on the low end for cheap Chinese knockoffs or consumer products from the likes of Young Chang, Kawai, Yamaha, etc. If you are trying to sort out the middle/quality or top of the market, include European brands, or buy a traditional grand piano, the book is incomplete and based on heresay/opinion rather than research. It is not terribly useful and can be at times misleading.