Synergistic Research Active Sheilding Quandry

I'm wondering if many listeners have compared the Synergistic Research mini power couplers to the more advanced system now called the "Quattro" (but has gone through several incarnations)which powers the active shielding. If so what are your thoughts? Is there really much improvement? What is your opinion of Active Sheildng in general? You can view my system at:
http://forum.audiogon.com/cgi-bin/fr.pl?vevol&1076767531&view