Quite good on the whole. The magic systems are interesting, which is what truly matters. Shifter is fantastically done, basically everything I could want from such a class.
Mesmerist: Eyebiter should probably have a prereq of Familiar, and not sure how it interacts with normal familiars! Otherwise I have no real input on this class. It's fine, not my style.
My one real dislike of this book is there's a LOT of content in here, like a LOT, but there are neither bookmarks nor an index. It makes it very hard to find any one thing.