You can get a brand new P20, and even get a generous trade if you like. You can try it for a month. If you like it, keep it and send in your trade. If you don’t like it, send it back.
Worried about a power cord? PSAudio includes one, but you can use your own. I started with the stock cord, changed to an AQ Hurricane, kept the P20, and changed again to the top level (at the time) from Transparent.
I would not characterize the differences in power cords as “radical,” as another poster suggests above. But it can be “noticeable.”
One mod I did make and stick with was to swap the arc fault interrupt 20 amp breaker on that circuit to a regular 20 amp breaker.
Instead of all the wondering, I’d just go ahead and order one. When I bought mine, they were built to order, so it took a couple of weeks to ship.
As mentioned in one of my earlier posts, the effect was dependent on the powered gear. It was great with my ARC amps and my Burmester amp. Lousy with my CJ amps. Neutral with my Denon HT receiver.
You’ll never know if you don’t try. And you do not need a consultant to come in and set it up. I do not use the wave shaping or other exotic features. I just set it on a 117 VAC sine wave, dim the display, and let it do its job. I was a complete skeptic before buying the used P12. If I’d only tried it with my CJ or Denon gear, I would have declared it to be a waste of money. But on ARC and Burmester, it more than justified itself and I consider it to be an important part of the success of my system.