The main thing I liked was the intro, as it helps the reader try to hold the idea that a world without prison can exist, even if it's something hard to envision. 

Otherwise, I would say that if you know a bit about the prison industrial complex and its abolition movement, you might not learn that much. For me, it added some historical context concerning the USA situation, and how it branched out outside this country as well. 

But other than that, I wish it went a little deeper. Could be because the book is short. Maybe my expectations were a bit too high as well as I found myself waiting for a quote to hit hard and it never really got there.

All in all, it's a good intro on the subject.