No quality issues for me either in 135 or 120.
Not quite sure what "lack of advertised speed" means ... surely a matter of developer and personal preference for how you want your negatives, as with any film?
I prefer Foma 200 to 100, I don't find it coarser grained than 100, in fact rather the opposite. I rate it at 160 and develop it in Rodinal. I didn't care for the 100, found the grain obtrusive and the tones a bit sooty.