Rodinal is one of the only two developers I use. I did try an EI test of Tri-X at 12,800 (I know, I know!) a few months ago that I'd read about. It was 1 hour with one inversion every 5 minutes and I got negs that Ansel Adams would have coughed up blood over! I'd guess the EI was about 1600 but the b+f was sufficient to view a solar eclipse through! I'm not sure, but my guess would be that stand development may only work with the old thick emulsions.