Certainly, Adam Kahane has been involved in some remarkable working groups. The basic idea of transformative scenario planning can get disparate, even opposing, groups working together towards a common goal.
Unfortunately, the "basic idea" is about what there is in this particular book. For example, it's amazing that you can get people who have been in violent conflicts with each other, even (as is mentioned in the book), specifically trying to kill each other as individuals, and have them share ideas. How you get them to do that, though, is not covered...just the fact that it happened.
Another element which makes it not work as a practical "how to" guide (and it may not be intended as that) is that the author honestly says that the conditions have to be right for it to succeed...and mentions times when it didn't. It's a bit like saying, "So, you want to eat pizza tonight? First, you need to have a pizza..." Well, yes...if you don't have a pizza, and you aren't told how to get one (either making it yourself or perhaps having it delivered), that doesn't do you much good.
Kahane is clearly a person to be admired, but I can't recommend the book for people who are hoping to learn how to get their own communities "unstuck".