Book exceeded my high expectations. Eberron has been my favorite setting since it released, in part due to the evocative descriptions and the enormous pile of plot hooks available- even just to spark imagination. "Exploring Eberron" carries that on in spades; we get not only info on barely-explored parts of the world, but we also get background framing and reasoning for why the world, factions, organizations operate the way that they do.
As someone especially fixated on deep characters, the huge swaths of info about places like pre-Mourning Cyre really help alleviate the 'nation of hats' syndrome that a lot of fantasy worlds struggle with. It's much easier for me to use the new material to make coherent backstories, easily dropping in tidbits from Keith's off-hand mentions, or occasionally reading a line and being inspired for a whole new character story. (Now, if only I got to play in enough games to use all these characters...)
I also really enjoy the conversational tone that the book uses. That may not be the right term for it, but rather than coming across as a dry 'this is the setting, here are your pieces to play with' it feels more like an open letter to the reader; akin to Keith saying, 'here's a bunch of cool things I've done, and here's some blanks I'd love you to fill in!'
Overall I think the book is fantastic, and am grateful to the whole crew responsible for it that they shared it with us. Thank you, and please keep them coming!
[5 of 5 Stars!]