Ken, huge kudos go to you for taking the trouble to bring these products to us! I'm sure that it is a lot of effort. It is obvious you have very high standards for quality, and are unwilling to compromise those standards. I really appreciate the opportunity to "play" with this stuff as I try to improve my own sharpening process.
I now have your nanocloth strops in 0.75μ, 0.25μ and 0.10μ poly. I also have Jende nanocloth strops in 0.25μ and 0.10μ poly.
First the strop material. There's really no contest here. The Jende has a slightly coarse feel to the touch, whereas your nanocloth feels plush. Not necessarily deeper, just much more plush. More importantly, this difference comes out in feel as I use the strops. Do the two products produce different results? I don't know (yet), however, I always reach for your strops when sharpening and delegate the Jende strops to comparison testing. A high quality tool is a joy to use.
As to the 0.25μ poly. For me, this brought the 0.10μ into play. Now, doing my standard cut tests I feel and hear very subtle changes between 0.75μ and 0.25μ, and again between 0.25μ and 0.10μ. And as I said before the improvement from my 2.0μ CBN strop (horsehide) to 0.75μ (nano) is small but not subtle.
These are qualitative reactions and I really need to put some numbers to all this. For the high-alloy steels, what I'd really like to do is get 3 or 4 mules in S110V, sharpen them using different methods, then use the Edge On Up tester to measure sharpness before stropping and after each stage in the stropping process.
I'd also like to do this with a knife in shirogami or aogami that is taken through my normal (not Venev) stone progression to 8K. My suspicion is that the effect of the finer emulsions will be more noticeable on the very fine-grained carbon steels.
It would also be interesting to do a blind test between a chef knife sharpened to 8K and not stropped, a knife sharpened to 8K and stropped to 0.75μ and then a knife sharpened to 8K then stropped through the sequence to 0.10μ.