This book took my attention by the title: 'C Programming for Arduino'. I thought it would try deep issues of the Arduino, like core libraries or code development for bootloaders but was disappointed to see that is a book of 'Arduino programming language'.
His reading is enjoyable and touches all important topics of Arduino programming. It is a recommended book for beginners who have some knowledge of electronics and programming and are interested in creating interactive objects or environments with Arduino.
From my point of view, the book addresses issues that are not very relevant in Arduino, like music or interface with graphics frameworks, leaving important issues without a good treatment (Ethernet chapter has 9 pages talking about the Ethernet protocol theory and only 4 of specific Arduino programming). Do not goes into detail on object-oriented programming, one of the big lacks of the book, but it takes many pages talking about Max 6, a graphic framework without relation with Arduino.
In short, it seems a pretentious title for a mediocre book, can be interesting for a beginner but not for someone interested in programming in C for Arduino.