I haven't processed Delta 400 in Rodinal but I have processed Delta 100 in it and I didn't like the results. Same with TMX. Both films seem to loose their special fine-grain smooth-tonality characteristics when processed in Rodinal. With TMX there is also a kind of flare around strong highlights (as if the grain is spreading into surrounding areas). My guess is that Rodinal works best with conventional emulsions where you want maximum impact. I used to get specatacular results with HP5 under studio lighting conditions (using a single flash reflected from a silver umberella).