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I saw Tachyon when Mark C. was here for the IAA conf. & i was sold on it! Who's got it in stock?
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I was going to say that that was me, Mark A., at the IAA conference. Then I realized you probably meant the Illinois Arborist Association conference. I was at the Indiana Arborist Association conference and had a hank of Tachyon.
Tachyon has a good, firm hand. It is slightly stiffer than other 11mm-ish arborist lines. Knots have to be tied, dressed, and firmly set. Works well with all of the split tails that I have tried so far, although, as with all rope/split tail combos, the friction hitch may need to be tweaked by changing the wraps, twists, braids, or crosses. Also works well with ascenders. Haven't tried it yet with devices that bend the rope (eg. Gri-Gri).
I think Sherrill has it.