I'm not super-familiar with Harry Dresden--I've read several of the books, made it to partway-through-book-five, and I liked them, but I haven't gone back yet--and there were a couple of reveals in here that came as a surprise (although keeping in mind who Harry's godmother is, more of a surprise in detail than in kind).
White Court vampires: now much much creepier than I remember. Much. I approve.
Oblivion: interesting! Heavily spoilery, though, so not getting into that.
A very fast read, but a fun one. Liked how throughly both Bob and Thomas have Harry pegged. Lovely art--I appreciate Mignola's work, but it often doesn't quite click for me, and I didn't have that problem this time.