Thanks Ole! I rinsed the bottle a few times, then filled it up and let it sit for a few hours just in case.
Looks pretty good... Cleared 400TX leaders in about 45 seconds. I rinsed the test leaders in a cup for about a minute (just for testing), photo-flo'ed them as usual, wiped off excess water, then stuck a paper pH litmus strip to the emulsion to draw out whatever is in there during drying. Perfectly neutral, even with my use of plain filtered tap water. So with 3-5 minutes fix and even the Ilford water-saver rinse routine, this stuff should be real good. Haven't tested it on paper yet (I rent darkroom time by the hour, not sure it will be practical there).
I noticed a little ammonia smell during mixing and pouring, but nothing much really. Probably less in quantity than the acid smell of Ilford RF, but a little more noticable -- perhaps because it's different. Smells like Salmiak candy for thoise who are familiar with that.