I bought and read Demonsbane as well, and thought it was better than I expected it to be. The setting seems very Warhammer'ish to me, which IMHO isn't a bad thing (love the fantasy and sf settings for WH). My only gripe was that it was far too short, especially for the price Fictionwise charge for it.
I haven't read Legacy of Blood, and won't any time soon. I have far too much already waiting to be read!
Craig.