I of course haven't read the book (and know nothing about the authors), but I have a contrary opinion just skimming the TOC. It seems like a rather comprehensive look at fatigue, their causes and treatments in various different settings. Looking at various normal/pathological fatigue could enhance the understanding of fatigue in both general and specific to ME/CFS. It also highlights why focusing on fatigue won't get us too far in ME/CFS. I wouldn't throw it away just because the authors are not up to date with ME/CFS.