I must say....while I enjoyed Steelheart....Firefight has gone and done what many of Sanderson's other books (and other Author's books of course) have done and left me a broken wretch hungry for more.
While I experienced some minor disappointment at David not accepting 'Epicness' (This is now a thing) and forming the dynamic duo with Megan, or possibly the terrific trio with the Prof as well, I understand and no doubt enjoy what happened a great deal more (Grass is always greener etc). Can't have every childish need fufilled =p.
The part with it being about overcoming fears and Megan showing up etc made me scream...like a young female child...at 4am...waking half the house...because I didn't stop reading till I was done.
I'm now almost as excited for Calamity as I am for book three of Stormlight....Sanderson can only be considered my favourite author by this point and considering I stumbled upon him due to WOT =D.
I even religiously follow many of his writing tips in my own 'Authorising' (Another word which is now a thing...sounds better than saying random short stories and half done world-building).
The title 'Calamity' certainly makes me think they are going to blow up the moon(Calamity)...possibly with a giant laser.