Having read Speed Secrets 1 on Kindle [and found it wanting in some respects] I then purchased both Speed Secrets 1 and 2 in paperback and find that for books of this type, with diagrams, the printed format is still the better option than a kindle verison. The book Speed Secrets 2 is excellent, a very useful book, well written, that contains a huge amount of interesting and helpful advice for a novice race car driver.
I liked reading this book, as it is split into lots of small chapters, which means you can pick up and read only when you have a few minutes spare. It is american based, but the principles here are mostly applicable to anyone who races. You just have to ignore the American language at times.
Overall I think this whole series of books is a good reference, even if it just reminds you of something you already knew, but this makes you think about it again. Definately worth purchasing.