I had an "Oh, RIGHT" moment when I went back and re-read the bump passage at the beginning of the Prologue. Of course, I may be wrong, not having read the book before.

I'm nearly at the end of C5, and I have to admit I'm not totally into it yet. The writing style is immersive, but there have been one or two (very minor) editorial inconsistencies that have left me feeling not entirely comfortable while I'm reading. (I should probably point out that I'm a freelance editor in one of my many incarnations, so this type of stuff bothers me a lot more than the average reader.)
However - great magic system (wish I'd invented it), intriguing characters, nice start to the grand heist storyline, and I'm enjoying the chapter notes at brandonsanderson.com. I like Kelsier (he reminds me a bit of Locke Lamora), and I totally get Vin's paranoia (nicely done, although laid on a bit thick at times).
Onward and upward.

Hx