This is a very complete and detailed book. I think that the authors give us a very good review of the BMW bikes. They write not only about technical specification, but history as well. They have good pictures, photos and technical data. What I miss is that they forgot to write about some types ( R-3, R-61 ) and they do not give the technical data of all types of BMW bikes. The advantage of this book - can be read as an interesting story - is also the disadvantage of it. What I would try, if I were the author, is that show the types one by one, not forgetting the stories, but more sistematically show us the BMW bikes, one or two page for each, including photos, pictures, data. Otherwise the best book I know about BMW bikes.