I got a lot less out of this than I did from The Visual Display of Quantitative Information, which is to say still a fair amount. I thought it was an enjoyable read nonetheless and certainly worth spending a few evenings on. The main thrust of the book seemed to be that it's important to show the reader information in a way that maximally enhances their understanding. Beyond that there's a list of examples of what to do and not do, and I'll remember those down the line when I'm looking at or making pictures.