My two cents - their first principles sound seasonably sound, but the conclusions they draw from them are sometimes questionable. There were several times reading it that I almost sputtered in disbelief, thinking "dammit, that's not how it works!" Now, some of these I can accept as simplifying things for the sake of argument, others I cannot. (Sadly, I didn't keep notes of them. In retrospect I guess I should have.)

At times I felt the authors were somewhat condescending, too, especially when it concerned stretching. I got the impression that strength was the only measure of success they accepted, and any exercise form that contributes to other goals - like stretching to promote limberness - are therefore worthless.