Very interesting thread!
I've been researching different options to see what's suitable in my area, as well as what's available. Lately I've been trying out the 8822, as well as this product from Tractor Supply, which I'm assuming is similar to the Opti-sorb, and it actually comes up when I googled Turface.
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So far I've just used a 50/50 mix on a few things I've had to repot this winter, and will try it in a few seed trays & maybe a propagation dome to see how cuttings strike in it. I'll probably try some with the fines and some with the substrate.
So far I've only used it for a bougainvillea I was given that had to be cut back & down potted (couldn't fit in the greenhouse)as well as a few bare root trees I ordered, & some things I had to collect before they were removed/poisoned.
If they survive the abuse of the cut back & potting, I'm excited to see what differences I see from this blend vs the nursery soil mix I usually use for non-bonsai plants.