An interesting book with nice photographs and printed on good quality paper.Bit light on for detail.If you like plenty of colour photos and something to read then this book is okay.
I recommend this book:
"BMW 1975-2001:model by model" By Laurence Meredith.
Poor:
... Mostly unenganging, poor on historical details, and basically your boring coffe table book about BMW. I got the feeling while reading this book that this must be your standard issue info book at BMW's musseum in Munich. (I got as close as the Olympiad Colisseum so I cannot testify to that personally.)
On the plus side, you get a list of BMW's internal model codes. That you'll need in anyway in order to follow the book's poorly written structure.