GURPS books are always well-researched and well-written. GURPS: Martial Arts is no exception. It covers much more than the usual Eastern unarmed combat, although there is plenty of that sort of thing. Lots of options for melee weapons, too. And I now understand why I was often confused by GURPS...our Majestic Wilderlands group is using a lot of the MA options. Rob did create a handy cheat sheet, which helped a great deal. But now I can read the source as I hold it in my hands (not a fan of reading things like this as a PDF).
My only complaint is the illustration of the blow to the groin. Unlike most art, it doesn't get me psyched for gaming.