takes a little while but once it gets to the real Mayhem bits (pretty much 2:30+) it's totally solid, and seems to improve as the song goes on. Course though I love distortion in mayhem tracks so maybe that's why I don't like the beginning.
Lungs is jarringly different from Florence's work that I'd listened to before. Not as big a fan of it, actually. Although there are a couple good tracks in here.
Pretty sure at this point I can honestly say PSG has my favorite anime OST of all time. It's got a considerable amount of variation in it, and just kicks ass.