I bought this book which is very large and heavy at 800 pages. Less than half the text is about the air war and that from the German point of view. As to historical accuracy that is hit and miss and it can be a challenging read. It says it not bias but is generally scathing of the Allies and praising of the Germans.
If you have nothing else then maybe worth adding to your library. A lot of work went into it. The original German version edition may be preferable. Apparently the kindle version is poorly produced. It all depends what you require in a book.