I only shoot 35mm right now, so this is my Foma experience. No QC issues in this format. The 100 I shoot at 50, the 400 at 200 or 250, and the 200 I haven't figured out yet. All I know is that it builds contrast very quickly and hasn't liked my D76 developer very much. The 100 is the bomb in Rodinal at 1:50. Just beautiful stuff. The 400 works really well in F76 stock, but it didn't like my one experiment w/ Rodinal.
I prefer the 100 and 400 grain more than Tri-X grain, unless the Tri-X is developed in Rodinal. But, if you liked the look of the older Tri-X in D76 stock, you can get that sort of tonality w/ the 100 in Rodinal at 1:50. Sometimes I use a 1:25 dilution, and you get this all-over grain that is really cool!