I have read this book interested in the idea of improving my knowledge in communication skills. I spend so much time building slides and adding some new perspective/style to the slides was other reason to read it.
The idea around the book is oldest than the wheel, but the way each detail add a meaning for the whole concept is great. It shows for different cases how to build a simple or complex draws from different perspectives.
The most important thing again is: you need to have clear the idea you want to show. The practices helps on adapting a common language and in the creation of the desired representations.
I miss some other use cases and more draws. The existing are very good, no complaint about them, but I miss a little bit more.