Just put the PS Audio P-10s into my system - 1 for each side.
Noise floor dropped to dead silence. Synergistic Powercell removed(1st generation - currently for sale). PS Audio AC-12's feeding the P-10's. System got a bit too lush and recessed. Replaced the SYnergistic Hologram D pc feeding the NWO cd player with a Hi Diamond P-3. Change was amazing - dynamics returned, as well as imaging and PRAT - cold. All cables were not broken in, except for the Holgram D. P-10's were in their first hour.
Bottom line - COLD and unbroken in, system sounds more musical and accurate than it ever has, plus its now protected from electrical disturbances, etc. Having a steady, pure 120v going to all my gear is also a good thing.