This book is an extremely comprehensive review of the 107 series, from its inception, details about the car, its changes over the years and successor. This book is not a buyers guide, so buy it if you're interested in the car, not looking to buy one. It also covers the rally cars etc.
I would also add that it is written from a worldwide point of view which is great - so many of these Mercedes books are very USA model centric - this book take a very comprehensive worldwide view. On the downside, there are some inaccuracies for the Australian spec models which were different to the USA ones (e.g. no CAT until 1986), but overall the book is very good.
The book also contains information about product numbers and specs for each year. These are spread throughout the narrative instead of being in table form for comparisons.
overall I'm very happy with this book.