Hi, Anton,
I think they are recorded OK, not superb. The newer pieces (the above songs are from 'Tabula Rasa') tend to sound better then the earlier.
I'm jealous you got to see them. I was out of town when they came to my area - twice ! Arrrrrgh....
I only have their material on CD, so that's my sphere of reference. I had an acquaintance who owned a couple things on vinyl (I think I remember seeing Halber Mensch out once), but I never got to hear them.
On a related note, though: I had a 12" single of Fad Gadget doing "Collapsing New People" with EN as a backup - GREAT version of the song, and very good recording !