I'm a big KoL fan and I had been waiting or this album for a long time. In my opinion, it's certainly a progression from the previous two albums - more mature with more going on musically. So much so, that there is a lot to take in on the first listen, i'd argue. I recommend listening to it again either immediately or a little later and the really album comes to life.
The overall sound is quite different to Y&YM and ASH, which were more striped down in comparison. This album, to me at least, has somewhat of an 80s vibe to it. Not the bad stuff, rather all the decent guitar bands of the era. "Charmer" for example, sounds remarkably like something off of Pixies' "Sufer Rosa" or "Doolittle" albums, it's uncanny, complete with screams, repetitive bassline, distorted guitar chords and leads. "McFearless" reminds me of early U2 material. "Black Thumbnail" opens with a more familiar KoL sound but soon rocks out hard, when they step on the gas. Incidentally, the heavy parts on this album really are a lot heavier and fuller than on previous albums and will certainly get you moving.