I just used TF-3 for real. Real interesting results! I developed two rolls of 120 Delta100 in Microdol-X 1:1 (12min), and fixed them in TF-3. Clearing time for 35mm Delta100 was 50sec, so I fixed 2.5 minutes for a little margin. (I didn't have any extra 120 to test on. Didn't think of it when I loaded the tank, and didn't want to to go back after the fact and snip a piece off.)
Side by side on the light table, next to 120 Delta100 developed exactly the same, but given an acid stop and Ilford Rapid Fix (4 min) there are some very obvious differences. First, IRF never got rid of all the pink dye on this film, while TF-3 cleared it completely. Not a trace. And second, and more interestingly, the TF-3 fixed film has a distinctly warm hue, kind of brownish in color! Is Microdol-X supposed to leave a stain, or is it the fixer? Subjectively, I'd say unexposed base is a little clearer, but it's hard to tell if it's just the lack of pink dye.
Looks like a keeper to me!