It's a really good song, I don't consider it a demo, with a better mixing it would be enough to sound similar to the album.
I don't think that Manny mixed this song.
Xeroboi said that Chester does some rap style vocals and actually he is right Chester does some backup vocals in the bridge similar to what he did in the Papercut chorus, it sounds badass.
the energy it's massive, too bad that Joe didn't scratch on this.