It had a nice way of solidifying certain (especially functional) programming concepts for me. However, one potential either annoyance or advantage to the book, depending on your perspective, is that it at times teaches relatively simple programming concepts by using what could be considered more difficult math problems.

For example, finding a square root using Newton's method and implementing the Fermat test in Lisp. Such problems could either be seen as fun or annoying depending on your background and/or enjoyment of learning this type of stuff in addition to programming concepts. They do tie in together nicely, it's just something I'd mention for someone looking into studying the book.