Come for the genuinely unique takes on old standbys, stay because you got eaten by a dire pelican.
If you are running Trilemma with OSE, B/X, or most of the OSR D&D or D&D-like games, this is a MUST HAVE supplement and a very good value!
If you enjoy Trilemma Adventures and want to run it with B/X or Old-School Essentials, this is the book to get.
This book's version of orcs are worth the price of admission and it is full of amazing world-building and great takes on old favorites.