This is the only comment received since June 2010. Although Tholenaar died before the book was published, I believe he was alive and responsible for the captions as well as some of the introductory texts.
I completely agree with Paul's comments. The book is visually excellent (in spite of reproducing many type specimens in gold (!) ink. But the captions are generally useless, obvious comments without any real knowledge of the specimens. I understand that Jan Tholenaar died before the book was published; that might be the cause of the lack of intelligent, pertinent captions. -Stephen Saxe