Rewatching those reminded me of how phenomenal Demovibes 9 is: http://www.demovibes.org/dv_info.htm

As far as the Farbrausch comment, I think the appeal of Debris, in particular, is the stunning audio component of the demo. Chaos Theory is beautiful, but the audio/video components don't feel as tightly integrated as some of Farbrausch's work.