What a solid german band, extremely progressive and obsure, and one of the fore-fronts of the 'krautrock' genre. I have the album Yeti and am really pleased with it. Up there with Can and Faust, and maybe even beyond them.
Yeti is a great album, check out Phallus Dei. Its a very solid album as well.
'Yeti' is fantastic, I also love 'Hi-jack' by them, probably even a little bit more. Absolutely fantastic collective and definitely a collective that no krautrock fan should be without.