Power Conditioner for Amp

I will exaggerate a little to make a point. If you think you need power conditioning for power amps you are wrong - you need different amps with much better power supply.
Now, in some areas the wall current is so bad that even best power supplies can’t take it all. Then you might try something. This is not really my opinion, that’s what Flemming Rasmussen of Gryphon and Vladimir Shushirin of Lamm said.
But first - better power cords, they are in fact extension of power supplies.

Anyone tried Accuphase regenerator/conditioner ?

Yeah, Gryphon amps incorporate some elaborate things in their design. So they should, certainly for the price.
But wall current has been getting from bad to worse and going downward. Amp designers have to pay more attention to this. If they do, that's good, but the prices will go up.