It's a little Locke Lamora, a little Prince of Nothing, a little Madoka. Upon finishing the first 3 books, my main thoughts were, "that ending was much more satisfying than I expected," and "holy shit dude planned out everything." There's mad foreshadowing up ins. The magic system works. Pretty much everyone is smart.
I'm serious about the foreshadowing, both in each book and the series as a whole. It's nonstop. It was quite enjoyable to figure out where things were going.
I haven't heard too much about this series, aside from my one friend who's been trying to get me to read it for a while. It is quite long, so I guess that hurts it some. I see there's 3 more out now, anyone read those? I'm actually inclined not to, because of the finality of the ending. I wouldn't mind more stories from the Final Empire, though.