I like Reminiscences of a Stock Operator most for the picture it paints of the early days of stock trading. The "bucket shops" have an atmosphere more akin to off-track betting than Wall Street (no need for you to comment how similar those two things are in other respects). Peppered throughout the text are little snippets of common sense wisdom about investing, most notably, that a rising tide raises all ships. It's the kind of sentiment which is useful when trading, and maybe one should consider it more often, but honestly: if you're the sort of person inclined to read this book, that's probably a principle of stock trading already familiar to you. The book doesn't exactly tell a well-formed story, but gives a nice thumbnail sketch of a high-rolling character from the early 1900's, and follows him through a few ups and downs. Highly recommend for people who like to think a lot about investing.