Here I thought I had a remote chance to win the FIST Jam...then R Kelly comes out with this beauty of a reimagining / supplement.
It can serve as either, providing alternate PC types for play in their own unique circumstances or for merging into a more standard FIST unit. The most wonderful thing is how the modified mechanics of play, in particular stat checks and character advancements, both promise a unique experience AND allow co-play with more traditional / core rulebook tactical espionage personnel. Compatible differences make unique characters who can still hang, or who can be the focus of their own stories. Fantastic!