I really liked that Sanderson finally got around to showing off the Free Kingdoms. Especially since that means more talk about "magic" and "technology". Sanderson really starts pressing into the land of Clarke's third law. The sufficiently advanced silimatic "technology" of the Freelanders really is indistinguishable from magic for the reader, and Sanderson plays around with the indistiguishability. The Alcatraz series really is a fun look at the tropes of fantasy literature, wrapped in the guise of a children's book.