This book offers very clear, respectful advise and case studies. It shows that the symptoms can vary according to the severity of the cause and how people's bodies are built. No Instant Cure, no promises, but it does give a very useful, general approach to how to understand and manage the overall problems.
They provide just enough structural and physiological information to help the reader anchor themselves in a real understanding what's going on. A lot of the books spew out a lot of muscle names and nerve names kind as a way of groping for credibility, without really making sure that information is something the person can use.
They're open to the ambiguity, and lay out alternative explanations, for some of the big imponderables in RSI -- such as why some people get injured others don't, or why some recover and others don't.
They have pretty darn good descriptions of the nerve glides and stretches and so forth that a person needs to do. One of my great frustrations with even skilled physical therapists is that they describe a stretch and then walk away, without giving the patient good instructions that that they can follow when they get home.
The most important thing of all is this: the book seems honest and clearheaded and genuine, and it's clear that they're really interested in helping to move the ball forward in understanding RSI.