My first review here, but I feel obliged to do it after reading the two stars review.
The book is absolutely fantastic. I love this kind of books and this is really "hors-du-common". The explainations are concise and straighforward and it covers an amazing array of topics in a short space (I cannot think about a single unnecessary phrase). In each section, Chris Scott refers to brands and products -yes, real names- in the most objective way: "who needs this?", "they tend to break", "good but overpriced" and the like. So honest that he can even look "politically incorrect". And there is also some acid humour and found it never boring: you are not interested in tyres? Just skip it and go for camping equipment.
I planned a long motorbike trip but in the end was a overland journey by car, and the book was still VERY helpful since many topics are actually in common (tips about regions, carnet de passage, etc). If I wanted to be extremely picky, I could only blame the tiny b/w pictures, but there are so many all around supporting the sections that it is the only way to keep the book small and cheap.
The two stars reviewer should have bought something titled "European Motorcycling", and even for Europe, I find Adventure Motorcycling useful (luggage, winter, etc). At least for me, it has been.
You can re-read and still find it interesting, you can take a couple of minutes to cover just a matter, you can learn from others' experiences (they summarize experiences in regions with data like what bike, how much, how long, biggest mistake, etc), enjoy the excerpts from some motorbike travel books included or just dream about a desired adventure motorcycle travel reading any of the sections.
A MUST, 5 well merited stars. Full stop.