One reviewer [2] notes: "The effect of the first few Shakti products was not as apparent as when the effect became compounded. Each built on the others' ability to eliminate EMI in the component on or under which it was placed. Music became more relaxed, with greater clarity. Space and ambience increased. The soundfield became considerably more open and defined. At a certain point, the effect became quite startling as another Stone or On-Line was added. Shazaam!"
[1]: http://www.shakti-innovations.com/audiovideo.htm
[2]: http://www.audaud.com/audaud/DEC01/EQUIP/equip3DEC01.html
PS: Sorry for bringing these up. They're quite the recurring joke in audiophile discussion.