A great value for its price. This book has a lot of useful templates, most of which are pretty easy to apply. It is a great way to change up creatures to keep the players guessing or make an old monster seem new. I liked how not all of the templates were geared towards just making monsters tougher. Some, such as the blind seer, create a way to add new story elements. Not all of the templates increase CR. Some decrease it, which is a great way to let you use more powerful creatures at lower levels.
[5 of 5 Stars!]