I like his books for the non workout content. I’ve read all 3 of his Core Performance books.
Core Performance - May 2005
Core Performance Essentials - Dec 2005
Core Performance Endurance - Dec. 2006
By this I mean (using his terms):
elasticity is so so depends on which book you get
Essentials has a little less content than the original book but is laid out a little better and he has done a few things differently.
Endurance has a lot of great stuff on imbalances and the stuff in there is a bit more involved than his previous books but it’s obviously geared to marathoners…etc I think this one has the best material in terms of regeneration though.