I picked The Elements of Style up out of an interest to improve my writing, and I did feel like I learned a lot, but it was also incredibly dry to read. Maybe that has to do with Strunk's obsession with simplifying and condensing every sentence, but it did make it a slog despite its short length. 

Reference books, by their nature, are not meant to be read linearly anyway, but I wanted to get a general grasp of the concepts so I know what to look for when I need it. I can't really fault the book for not being top-tier entertainment, though.