Who Tried Power Conditioners Over The Years and No Longer Use Them Today, Any Why?

Solutions in search of a problem: I have two 20 amp dedicated circuits to my audio system. I was not aware of a power supply problem but thought I would give a PS Audio regenerator a try. I could hear no difference so I returned the unit. Then I bought a couple of Furman Elite 15’s. With this I could indeed hear a difference, but it was clearly negative. My Rowland amps sounded harsh and nasty so they went right back into the wall. It took me a little while to realize what was happening to the rest of the system: flat, lacking dynamics. Even a lowly CD transport was audibly effected. Not sure how that is possible but there it is. So now everything is back direct into the wall and it sounds just fine. Anyone want some Furman units in original packaging?

I could hear no difference so I returned the unit. Then I bought a couple of Furman Elite 15's. With this I could indeed hear a difference, but it was clearly negative. My Rowland amps sounded harsh and nasty so they went right back into the wall. It took me a little while to realize what was happening to the rest of the system: flat, lacking dynamics

@markmuse. I have never liked plugging an Amp into a power conditioner. Interesting though the negative effect on the CD transport. 

I've had sucess with Monster Power conditioners (pro5100 and HTS5100 MKII) on primary and secondary systems.  Also using Sonoquil cables in the primary rig; secondary uses cheap speaker wire from Amazon and OEM cords. No clue on the OEMs as to their preference.
To each his own re power quality. Happy camper here.

I've tried many, most of them were some kind of humbuster approach as I have a lot of DC on the line which makes my preamp hum.  All of them I tried killed system dynamics with or without the amp plugged into it.  The only one that removed most of the DC and did not kill system dynamics was the Emotiva CMX-2.  My amp is plugged directly into the wall (dedicated power line to a Porter Port plug) and so is the Emotiva CMX-2.  Everything else in my system is chained off one of the two CMX-2 plugs using Wiremold powerstrips.  Best setup I've found for my needs.  I also use a  EP-2050 at my mains box.

wrm57,
I have 3 dedicated lines all with Furutech NCF outlets.
The main one has a Niagara 7000 (with a Dragon power cord) which powers my Dac, Steamer and tube amps. The 2nd dedicated line has a Niagara 1200 which powers 2 subs and a few sundry pieces, and the third has a Niagara 1000 that powers my video equipment.
So, don’t give up on the other dedicated lines.

ozzy