I've developed ACROS in Rodinal (both 120 and 35mm)(posted 8282 days ago)1:50 10-12 minutes at 68F (first minute, constant mild agitation, 5 seconds each minute after)
I did find that the 120 seemed to need slightly less development than the 35mm to get the same density negatives.
Quality: different, but not really that much better than TMX, some shots are VERY smooth, I like it more than Delta 100, but I never really liked Delta 100 in Rodinal. ACROS does seem slightly finer grained, but with a bit less of a sharpness "bite" than TMX.
I've also developed some ACROS in Diafine, with pretty good results.
Film Speed : Seems to be slightly below 100ASA, I guess-expose most of my images anyway, so I just go 1/2 stop down from what I would normally guess for 100ASA.