This is an excellent book for the BMW motorcycle enthusiast. It tells the whole story since the beginning until around 1994. It presents it chronologically as technical achivements so one can see how one model was improved upon to become the next. And it has a lot of excellent photos. There are a few gaps (like, what made the R60/6 to become the R60/7) but I guess that that is unavoidable. The authors are very knowledgeable but left out a lot of interesting information BY DESIGN. They don't give us their opinion about what is right or wrong with each machine, and I would like to know the opinion of experts! For example, I have learned somewhere else that the old R60 models from the 1970s are forgiving for not-too-expert riders, a bit involved in maintenance (like adjusting valves every month), but easy and cheap to repair whereas de K models are more difficult to ride, very easy to maintain, but difficult and expensive to repair. This is the kind of information I would have expected in this book. I would also like to see more technical specifications. I still think that this is a great book but I pray the authors: expand the book in its next edition and make it the dream of every BMW motorcycle enthusiast.