This is going to be hard to type with only a few fingers not in pain... 
 Love Black Dagger series so this was a must. Admittedly I wasn't that interested in reading about Rhevenge but once I started it was like torture not being able to read because of pesky things like work and sleep. 
 Ward really did a masterful job in fleshing out a virtually unknown character up until Butch's book. We only started getting glimpses into him in book 4 and then suddenly he was again a background character we heard little about. I think the reason for this was to really shock us with this book and let us know that she's really planning on shaking up the fans with revelations and real depth in some of her newer characters. 
 Ehlena is a new one too. We caught a small glimpse of her in 1 book. I don't even remember where but it was there and suddenly she's in the forefront as a leading lady and I think she'd my favorite of all the female leads. She's more real than any of the others and she has real problems. She also can take care of herself but had her vulnerable moments that leave her wanting Rhev as her man. 
 So worth the time and effort of reading.