Ah, I forgot to reply to your last post (I've never heard of "Ich war neunzehn" before but your review sounds interesting, so I might check it out in the future - but I certainly got a backlog concerning east German films in general).
No, I haven't seen "Her Third" yet. I wanted to figure out in which direction Gnther developed himself after "Farewell" and what A told me about one of his last features, the post-Wend-Essay "Stein" (1991, "...quite Godardesk, maybe similar to "Notre musique...") softened my Interest in his later works immediately - but only a bit. Egon Gnther (being 80 now and still very healthy) was present at the screening of "Farewell" I attended and he seemed very sympathetic and modest to me and he even confessed that he never intended to break walls in the DDR and that he just wanted to "play with cinema", that even most of his social criticism was unconscious. But he also confessed that he loved Godard (the early Godard, at least) at that time and that maybe left a bad influence on him. But A also told me that "Die Schlssel / The Keys" was - on the other hand - more similar to Antonioni and not too pretentious. So Gnther hopefully doesn't turn out to be an intellectual filmmaker in the future, I'm willing to explore more by him ("Farewell" really is nearly a masterpiece, you should try to get it if possible, it has been released here one month ago in a poor version - full screen [O.a.r. is 1:2,35]). But at the moment, I'm most interested in those three socialistic (of course they are - costley as they were) Science-Fiction-Films you mentioned (a colleague told me that they were also shown in our cinema a few years ago). It's funny because I already decided to buy a cheap but good 4-Disc-Set including those three films and a Soundtrack CD (it was also released by Icestorm Entertainment) when I read your post. If all those DVDs wouldn't be so @#%$ expensive... 

Btw, here are (German) reviews of those three films including some intriguing screenshots: "Der schweigende Stern", "Eolomea" (it was shot on 65mm Film - it would certainly be great to see it that way), "Im Staub der Sterne"