Overall, this is an excellent book, with details on Covenants and strongholds for Mages of both the Traditions and the Order of Reason. It goes into detail on several locations for the Order of Reason, several for the Traditions (including earlier snapshops of Doissetep and Horizon than in Book of Chantries and Horizon: Stronghold of Hope) and some for others.
However, the book suffers from one absolutely severe flaw: the lack of Covenant creation rules. These rules were promised in Sorcerer's Crusade and even in the text on the back of the book, though they just aren't included, leaving the Book of Chantries as the most up-to-date Chantry creation rules for Mage.
[3 of 5 Stars!]