I really like 400S but haven't tried 80S.

These are aero films remember.

I've tried it with Rodinal - it's quite nice if you don't dislike grain.
Caffenol worked out very badly - extremely uneven but lovely tones and grain in the parts that were developed properly!

I've seen some very nice results online from Robert Vonk (Fotohuis on this forum and elsewhere) using Rollei/Maco D74 and Rollei RHS. That's what I'm going to try next.