I'm a big fan of Kim Harrison and I've always looked forward to her Hollows novels, so I never understood why I had never read her YA novels. For some odd reason, I thought they were about vampires, having never read the blurbs even. My initial reaction was... it's ok. Not my favorites, and not as bad as some urban fantasy I've read, but definitely not at the top of my list. Hell, it's still a sight better than some installments from one of my heavily looking-forward-to urban fantasy authors. 
 That being said, the novel itself requires more than just a tiny bit of reading comprehension skills, so perhaps it is simultaneously too much for the worst YA readers and too simple for the best. It just didn't have the right mix. I think I would have enjoyed it much more had she written it for her adult audiences with the appropriate extra angst and gore and consequences. The basic concepts reminded me of Bleach with a bit more time travel mixed in. Pretty interesting, all told. 
 The rest of the teenager stuff I could always do without, but that's the nature of YA reading. I'm not judging against it. 
 There was just ... something ... that needed to happen, that didn't. Otherwise, I enjoyed the nice powerups and twists.