Cosmic trigger is, in large part, Robert Anton Wilson's autobiography with swollen appendices. It documents what he did and what he was interested in during various points in his life. As a result, it's structurally different from his other nonfiction. (For instance, Cosmic Trigger II and III are basically essay collections, along with a lot of his later work, and Prometheus Rising is structured like a tutorial or textbook.) It generally works, in my opinion. Because it's an early work, it avoids a lot of the repetition that later works engaged in. It also seems to have mostly aged well -- the worst things about it that I can remember are related to treating a couple different academic works (The Origin of Consciousness in the Breakdown of the Bicameral Mind and The Sirius Mystery) with more respect than would even have been afforded them in the early 70s.