The book is simply stunning. It consigns most of the graphical designs of the consulting industry into the dustbin of bad practice and presents some slightly unconventional alternatives, which actually do look more compelling on second thought. The standard rules of avoiding lie factors in graphics, maximising the data / ink ratio, the integration of graphics and text are all spot on and show how statistics, when done right, is far from boring, tending far more towards the fascinating instead.
The book also provides some splendid examples of good graphical design, shockingly most of them fairly old - i.e. the field did not progress nearly as much as should be expected, with most of the progress being pre-20th century, with several unfortunate steps back from the 1920s to 1970s (shown as well). Another interesting facet is the historical development of methods for presenting quantitative information, which is interesting in its own right.
This book should be essential reading for anyone who relies on visually presenting quantitative information and is an absolute must in management consulting.