The bass, obviously, is everywhere. The riffs are as crazy as ever, and sometimes you can't even believe it's an actual bass guitar he's playing. Of course, he plays a stand-up bass in two or three tracks, but I'm obviously not talking about that.
Ler's guitar work, while still pretty insane, doesn't quite reach its full potential here. Don't get me wrong, it's still pretty amazing, especially in "Hamburger Train". I don't even play guitar, so I shouldn't really be judging anyone here.
Herb's drums are as tight as they have ever been. The funny thing about Herb is that he never improves on his skills, because he's already damn perfect at what he's doing.
As for the songs themselves, there's lots of classics in this album, and even the filler songs are awesome to listen to. I can actually see a huge Residents influence in most of the songs, especially "Welcome to This World", "Bob" and "The Air is Getting Slippery" (in the latter, he actually cites them in the lyrics). My favorite tracks would be "Hamburger Train", "My Name is Mud", "DMV" and "Nature Boy".
Basically, this is one of the best albums I've ever heard. I totally recommend it, and you could totally say it's the best album from the Herb era (even though, in my opinion, all four albums are equally amazing).