I still have a bunch of Soundstream first and second generation car amps somewhere in a box. A couple of the class A (A30 or A50), the typical D50 and D60 amps too. Also had the original TC305 removable head unit that I had in my Jetta II in the mid 80's - damn fine unit that was farily reliable.
the amps sounded good and were generally reliable unless poorly ventilated or had to push very low ohmage speaker setups - then they would fail. Also occassionally had outputs fail too.
Sorry, no direct experience with the home gear although looked very nice, smooth, very German-Euro appearance like the ADS Atelier designs and Braun gear too. Many of their early home pieces echoed the industrial design of the TC308-TC305 head pieces - black faceplates, rounded ovals with plain lit buttons etc.
Nice if you can find them but no idea how good they were.
bart