For someone whose books I largely enjoy for the plot twists (and oh, what plot twists they are) I approached this collection with a little trepidation. Of course, Brandon Sanderson does not exactly do "short" - even in a self-professed collection of short fiction - but how would he fare with such word constraints when accustomed to constructing works of 500 pages or more? 
 Rather well, it turns out. 
 And that's mostly because the shorter format forces the focus down onto Sanderson's other real strength - worldbuilding. If nothing else, you can rely on him to come up with intriguing concepts and inventive magical mechanics. In no place is this better demonstrated that in the opening novella, The Emperor's Soul, in which a magical forger with a talent for rewriting an object's history (e.g. magically convicing a cheap old vase that it is in fact a priceless antique) is pressganged into forging a new "soul" (i.e. mind and personality) for the Emperor, after an assassination attempt leaves him effectively brain dead. If that all sounds a bit bonkers, it is, but Sanderson makes it work nonetheless. The magic system underpinning the whole story is fascinating, and for my money it is the best story in the collection. 
 Sixth of the Dusk is another particular highlight (more excellent worldbuilding), and Mistborn: Secret History, although fragmented, successfully made me want to go back and reread the Mistborn trilogy from the start. The briefer pieces that Sanderson wrote for RPGs and the like (e.g. Allomancer Jack) are amusing, if slight, and the lengthy novella Edgedancer, which ends the collection, is a little disappointing. I found that the voice of the thirteen year old protagonist really got on my nerves. (In character though it might be, it is very difficult to take a superpowered teenager seriously when she insists on referring to her magical powers as "her awesomeness".) 
 One of the more compelling aspects to the collection, is the way in which certain bits (Mistborn: Secret History in particular) start drawing together Sanderson's Metaverse, "the Cosmere", connecting the dots between different worlds and plotlines. I'm certainly interested to see where it all goes...