So, that one went quick. Detectable improvement after blind testing, not absolutely dramatic but very pleasant. The soundstage went from a tad 2-D to much more depth, especially things like organs, jazz ensembles have much better depth placement of instruments. The other very noticable thing is that the decay of things like piano is much 'truer', tremollo and drastic stops are much more noticable. Only slightly noticable is that some edginess went out from Sses and Tes on female vocal, much less radical change than going to silver interconnects though. Almost no downside, maybe the instruments are not as clearly defined as before and some low bass is less pronounced (albeit I don't know whether I just had a room mode before that even TacT didn't get).
Anybody using spikes on carpet and wanting to drag heavy stone plates around should try this I would say but as usual, your mileage may vary. My setup was:
a) thin cork plates (about 10x10 inch)
b) about 1- 1 1/2 inch thick granite plates
c) Axiom rubber feet
