Title says it all - it's hard to expect this book to be a real breakthrough, but there's a serious chance you can get something useful out of its 50 ideas.
What I liked most?
* I totally agree with "Start with no outputs"
* There was surprisingly much value in "Tell stories, don't write them"
* I like the approach described in "Avoid using numeric story sizes", but whenever I was preaching it, there was always a massive resistance (you'd be surprised with roles of the ones that have resisted)
What about the rest?
Clearly not that revealing, but it doesn't break that overall impression.
One last sentence: Gojko is not recommending this book for less experienced people who just start the journey with user stories, but I wouldn't be that reluctant. You gotta know the basics, but significant experience is not really required.