Only disappointment was that I was hoping the female would take the guitar solo. Around 2003 there was a crazy Japanese guy who did an all-vocal recording of himself covering Slayer's Angel of Death and put it up by MP3 (pre-Youtube days) but I can't find it. A music professor friend of mine once said that the evolution of Western music was strange in that the two kinds of sounds that humans make either imitate beating something rhythmically, or the tonality of the human voice, and Western music until recently neglected the former entirely in favor of the latter. So it's interesting that in versions of metal songs that return to more traditional instrument - strings like Apocalpytica, or the human voice as here - that they still end up including drums, much to their betterment. Ever seen Apocalyptica live? Their drummer might be my favorite that I've ever seen perform.
There's something to be said for a genre that inspires this kind of passion and inventivity. You don't see people doing stuff like this for Philip Glass or Lady Gaga.