This was a lovely novella that I read real quick before starting alloy of law. I didn't really know what it would be about but that was a lovely surprise. 
The book goes past all that happened in the first three mistborn books, which was a wonderful refresher on the details for me. The way it was presented with it's perspective was a lot of fun and gave a whole new layer of enjoyment to the original books.
As I haven't read much else from Sanderson yet I kinda felt like I didn't get everything, but I know that will make more sense over time as I read more Cosmere books.

I very much enjoyed this book and would recommend everyone to read it who likes Mistborn and not skip out on it.