The follow up to "Way of Men" is a good successor but it doesn't quite hit the same heights.
The core is the notion of Us vs Them and how to create a meaningful and strong group and sense of who the We is. The book goes quite a way down the path into doing this, but I'm sure that there will be may readers who are either feeling to isolated to form their own Mannerbund or who were expecting a more prescriptive look.
The book also branches more into an Alt-Right worldview and Germanic pagan practices, both of which are interesting topics. However, they are both also topics that I have read similar things about elsewhere. The book is in general somewhat less original than Donovan's other works - although I think this may be a case of the people he inspired, and is inspired by, simply publishing related works.
In summary, it's a very good short book. It doesn't quite meet the very high expectations resulting from the viral success of "Way of Men" but I'm happy to have bought and read it and I'll read it again in a few months.