The title is a little cheesy, but the content is gold. It's one of the books I re-read (or re-listen to via Audible) multiple times a year. I find the repetition is really valuable since I can slip so easily back into my old thought patterns.
When I count books that have been most helpful to me, this one is at the top of the list (followed by "War of Art" by Pressfield).
For a synopsis, check out Derek Sivers book notes on it: https://sivers.org/book/StoicJoy
Derek's intro to the notes: "Rating: 10/10. Almost too personal for me to give an objective review, because I found when reading it that the quirky philosophy I've been living my life by since 17 matches up exactly with a 2000-year-old philosophy called Stoicism. Mine was self-developed haphazardly, so it was fascinating to read the refined developed original. Really resonated."