So the only thing keeping me from giving this book 5 stars is Sanderson's less than subtle nods to the PC police, and Wayne's almost forced attempts at humor in the first half of the story. Sanderson's comic scenes seem to be getting progressively more crude with each new book, and while I grant that Wayne is a funny character, and I love him, I'm a little disappointed. 
 I love the scientific way that Sanderson (for the most part) executes his magic systems, and Scadrial's are some of the best thought-out and plausible that I've come across. It's easy to speculate on the possibilities, because the rules are so well established. I didn't quite get the flying machine's power source, but it's still pretty cool, and that may make more sense on the second listen. 
 Story-wise, I think Sanderson's plots continue to get better and stronger, as do his characters. Waxillium, Wayne, Marasi, and Steris are just so real and relatable. Their inner struggles, beliefs and motives are so lifelike. Steris has become my favorite part of the entire Mistborn series, and quite possibly in all of Sanderson's writing to date. 
 Michael Kramer is a phenomenal narrator, the voices he produces are masterful. My only complaints are the occasional mispronounced word, swapped name, or wrong voice on a line of dialogue or two, and those are few and far between. 
 Sanderson also revealed the news that there will be at least one more book with Wax and Steris, and I can hardly wait!