This was a pretty good conclusion to the Skyward series. I liked Spensa's character arc, but a few things about it got repetitive in the first half of the book. However, it did come full circle in the end.

The first half of this book was decent (I think it could have been trimmed down a bit), but the second half and the final act of the book was just a nonstop adrenaline ride. I'd probably rate this book higher if I was just rating the second half. 

As for some of my problems with the book, I wanted Spensa to be more involved in the final act. She did have her moment in the end, but I wanted her to participate more. Also, I think the ending was rushed a bit and it felt a bit unfinished.

The Skyward series overall was obviously not on par with any of Sanderson's big adult series, but it was a pretty good YA series and this book was a good ending to it.