This is one of the books you question why you have to read it? Then you probably skip it, unless you (like me) are forced to read it by demands of an MBA course (or something alike).

When you read it, and starts to understand it, you usually starts to wonder why anyone hasn't told you this before! OK, CATWOE may not be the answer to all prayers out there, but it is important to understand, and the authors make it worth your while to get through this book. You will be changed after having read (and Groked) it.

The caveat is that you will probably need some experience or knowledge of business analysis before appreciating this book.

In short: worthwhile.