This book is worth buying three times over. To start with the write-up of the Maidens is fantastic. Then we get some Greater Arts of Astrology which really expand what Sidereals can do. Finally we get a balanced SMA, along with two superb CMAs.
If any of your players or major NPCs are Sidereals, or you want to play around with Crane or Crystal Chameleon style martial arts, or you want to be able to interact with the Incarnae - then get this book!
[5 of 5 Stars!]