I did an ATF change with 3 quarts of DW1 on my "new" 97 Accord with 248k about a month ago. It's possible the ATF was original, it was dark and burnt smelling, and it took me 30 minutes to get that drain plug loose, which usually happens when trying to break loose factory tightened fasteners. The magnetic bit in the plug had about 1 to 1.5 mm of trapped material. I couldn't find any mention of an ATF change in the maintenance records, at least later than about 90k, I got bored at some point.
The first day it shifted smoother, but it gradually got jerky again, but I'd say it's still a bit smoother than before the ATF change. Or it may be, that the first day was the only day to judge the change. I'll do another change in about 4k miles, I'm curios about what the magnetic plug will pick up.