Has anyone owned both P500 & hydra 8 / guardian

I have used several power conditioners over the last 8-10 years, including the ones you mentioned (they are excellent.) For me, the most recent game changer is the Acoustic Revive RTP-2, -4, or-6. They are expensive, but it is surprising how much better they are in my system. They are the only conditioner that I have used on my monoblock amps that have bettered plugging them into the wall/dedicated circuits. You can demo them and see what they do for your system.

Good luck

I prefer the Hydra over the PS Audio.