Peterayer, I compared the SP Rack not the later Ultra SS and Ultra Five feet. The Rack did use the new "technology" of StillPoint but had the liability, since removed, of having acrylic shelves. Again, however I could put everything on the SP Rack but only two components on Halcyonics. The top end was cleaner and quicker and I had, if I recall correctly, more sense of a sound stage.
Only in the case of my amplifier did I do a comparison in this case with the StillPoints component stand with the "technology" in its feet alone under the amp versus the Halcyonics on the Acapella Fondato Silenzio base with their little pucks between the base and the Halcyonics. In this case I thought the SP Component Stand had clearly better base.
The comparison under the turntable was with both on a Reference Mana stand. The Mana stands have points to the floor and below each shelf. It had been my plan to put the turntable on the StillPoints Rack, but I so quickly filled up the six shelves, that I never tried that.
With the turntable I don't remember hearing much difference with my Shindo turntable and as I said the guy who bought the Shindo also bought the Halcyonic on which it was placed.
Overall, I should stress that I only had two Halcyonics units and was able to put everything on either the SP Rack or SP Component Stands. The StillPoints sound had quicker attack and cleaner top end, where the Halcyonic did nothing.
I should also note that since that time, StillPoints technology has added improved technology in the Rack, in the new Ultra feet, and record puck. Overall, this has revealed more detail giving a very nice sound stage precision in knowing where the performers are.
Mike, by no means was the Halcyonic optimized. My listening room is on the second floor. Both Halcyonics units were used on Mana stands as I explained above.