Brandoff's is, in my opinion, required reading for anyone interested in playing F.I.S.T. It provides really useful advice on how to properly use the rules or bend them to suit your individual needs.
Degrees of success is a popular mechanism in modern RPG design, but it can be intimidating, even for veterans, to decide on the fly what a mixed success could mean. One the features that will keep me coming back is the partial success table included. If you ever feel stuck just look at the table for a little inspiration and you can keep things running smoothly.
Three Scenario are also included. They are all thematic and completely ready to plug and play. More importantly is every scenario is written using a different style and format. The differences are great for variety, but also bring inspiration for those who intended to make their own scenarios.
Finally, aesthetically this is really fun. Not only is the document its own character, but it's really cute and menacing in equal measure. F.I.S.T is fun above all, and this zine really honors that.