I have not taken TKD for over 15 years, but I remember Master Nunez. He ran a school in Odessa Texas that my school In Missouri used to travel to for Tournements, Instructors courses... There wasn't a finer instructor to be found in our organization.
Master Nunez was a boxer, kick-boxer,all-around fantastic fighter. If he has his name on this project it probably is worth getting for that reason alone.
I'm like you, I haven't ever heard about the other authors.Then again I've moved out of the TKD world into the traditional Karate world.
Although I no longer practice TKD I'm tempted to purchase this book anyway.