I read a digital version of this book and found it quite useful. The book provided a good foundation in logic and proofs that I needed in order to support my self-study in other fields of math. The book also gave me a solid understanding of the basic symbols used in the rest of math, specifically those used with regards to set theory and logical statements ("for all", "there exists", etc.). I can't say there were any profound moments while reading this book, but it got the job done.