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

One thing that has changed since the 90's is the explosion of devices that make up the average home. I'm sure there are papers out there that document how much the noise environment has changed.

@wrm57 Yes not sure I would need the AQ5000 only have 5 components and AH X200 is not that huge of a power hogg.

I got a Furman Elite many years ago, and I always miss it when it's out of the system. 

Trip lite 2400s I have a few. Slight mechanical noise problems.. All fixed.
I installed 20 amp detachable PCs and removed all the wire nuts and added crush connectors with serious pressure (cold weld) copper butt connectors. Copper Hubble outlets with contact enhancer..

Took off one super high frequency ferrite ring...  I added a copper grounding lug with 12 1/4" holes drilled. You just tighten the bonding screw to bond to the chassis or use is as a common bond for noise reduction.. Works pretty good 1/4 x 1/4" male mic cable works perfect.

I'll give mine up when power company provides one for my house. I doubt they much care about quality of power delivered to my house. I suffered with 123-126 constant voltage delivery for years, finally had to build bucking transformer so my audio equipment's transformers wouldn't hum me out of listening room. And possible damage to insulation on those transformer windings, you think they care. 

And then we have all these modern electronic gadgets in our homes and neighbor's homes with noisy switching power supplies. I have all the dedicated lines, high end ac outlets and power cords. These don't clean even your own home generated ac. Try using a hair dryer or dimmer switch on incandescent lights in your home while system is idling, even with the dedicated lines I can hear this crap.