I probably won't even use Operation Sarcastic Riot, but it 's an awesome concept, and a well executed one. It's a referee-centered guide on how to adapt OSR adventures to FIST, both mechanically and narratively. It's written in a casual and informative style, which makes it easily understandable, and a table of contents means that it's still easily reference despite this format.
Sarcastic Riot seems like it would make for a very fun "special episode" session in an ongoing FIST campaign, or by having an entire campaign centered around thwarting CYCLOPS with time travel. I'd recommend it to any OSR or fantasy fans out there.