I was very happy with this book. It's short, but adds something to the game that some players seem to need in a game like this: bits you can fiddle with as you go.

It can be somewhat expensive to use this new power. It's in the middle to high cost range to start with, giving you a set cost just to be able to use the power and also included is an initial points pool for buying the actual blessings and curses. You can increase the pool later as you wish. Should this turn out to be a power very suitable to the character, there's no inherent limit to how far you advance it. More points in the pool equates to more (and more powerful) blessings and curses in play at the same time.

As with almost every other power, this is an excellent tool to have but there is some inherent potential for it to pull you in new directions and complicate the life of your character. So in short it's both useful and interesting, which is exactly what you want out of a product like this.