No! I've vaguely heard of them, but never really looked at their stuff. You're right, they are impressive.
Is it just me, or does the Leipzig-SK with the ladder filter sound almost as SEM-y as the Telemark K with the SEM filter? It's a sound that I have sort of mixed feelings about. On the one hand, boy, it takes me back to stuff I used to listen to a lot. On the other hand, it's overpowering, and I worry about aural fatigue; I just couldn't listen to it constantly for years. That filter sound is why I'd prefer a monosynth based on the Prophet 6 over one based on the OB-6.
I think that if I was the kind of guy with a roomful of synths, something like the Telemark would be right at home.