There are a lot of cool ideas in this supplement to draw on with psychic powers, weapons, and NPCs and creature stat blocks. I like the versatility this offers to bring in the parts that most appeal to particular table (e.g., just the weapon mods or the idea of accumulating consequences from using abilities). And there's plenty of flexibility to customize these aspects even further (e.g., I could imagine adjusting the HEAT meter in response to my players' style or running a mission in a supercharged psychic environment where people accumulate extra HEAT).
The layout adds flavor while keeping the material easy to read. I appreciate the spin the author has brought to the general FIST aesthetic. There's a connection to the core rules, but they've still made this their own creation.