Interesting subject matter, but the book is quite short (under 200 pages of actual text) and feels a little rushed as a consequence.
The punctuation is quite poor in places. It is quite distracting to be reading a book whilst mentally adding commas and semi colons as you go in order for it to make sense. There is also (to my mind) an over use of exclamation marks. Exclamation marks are for dialogue (not for narrative) but this author appears to have been somewhat addicted to using them. For example; 'He went into more debt!' and, 'The cars were fine it was just the drivers!'. There are numerous other examples and I winced every time I saw one.
The narrative also jumps around a bit by mentioning matters that happen later on, followed by a sentence reading; 'more on that to come' or 'we'll come back to that later'. I'd rather the story were told chronologically, without the colloquialisms.
I also feel that the author's opinion comes across too strongly at points throughout the book, such as superfluous and irrelevant asides on the 'natural beauty' of the Lotus 79, or comments on 'poor Suzy' (Hunt's wife). I would have preferred a more impartial narrator who stuck to the facts (and didn't take sides). I bought the book to find out more about Hunt and Lauda and their perspective on the events which took place. I don't think either of them were quoted enough.
In short, I think it is clear (from the coinciding release dates) that this book was written quickly in order to make money from the release of the film, 'Rush'. Unfortunately it shows.
I only bought this as Lauda's autobiography (To Hell and Back) appears to be out of print, as the only copies you can pick up on Amazon start at £85. Hopefully the publisher will see sense and re-issue it now that the film is out.