Left Overs, who reviewed Empire in January, recently had this to say about the sequel: "Empire's End was a fitting and natural continuation of the first book, and I highly recommend reading both (and then joining me in bugging the author to write a third!)"
Spine Busters' thoughts on the original book: "Empire is just the hunk of literary meat to satisfy your hunger pains. Entertaining and thought-provoking, it brings something new to the killing field."
Correction 7/23: I'd mistakenly posted that Ursula K. Raphael, who interviewed me at The Zombiephiles, was also the author of the Spine Busters review. The author is Brandon Layng. Sorry for any confusion!