Very short review, since I just finished and it's three in the morning...but on the whole I loved this book. It was a v. fitting conclusion to the trilogy. Jemisin's voice is amazing, and her worldbuilding and plotting were wonderful. There were points in the middle where I wanted a bit...more of something that I couldn't quite put my finger on, but that vague criticism is the only one I can muster. I cried through the last eighty pages or so, though, which made a mess of my duvet and is rather unusual for me, especially when reading fantasy. 
 If you like fantasy with a bit of an edge of contemplating theology and eternity, I highly recommend this entire series - Jemisin is fantastic, and I'm eagerly awaiting her next project.