The Power Plant Regenerator debate drags on

ASR is a bunch of idiots saying stupid crap to get clicks.

The PSA regenerator converts the incoming power to DC, then inverts it to a near perfect sine wave (.1% distortion vs 2-4% incoming).  The voltage is adjusted to whatever I set it at.

It doen't always improve the sound--depending on the power supply of your component.  some components are very tolerant of distorted power supply.  But having perfect 120V sine waves makes sure the quality of the power does't limit your equipment. 

The power in my neighborhood is horrible.  Old infrastructure, power lines still on poles, and overdeveloped in the last 20 years.  Voltage swings, especially in the summer (think all the air conditioners), are significant.  Momentary drop outs are common and the lines are noisy, very noisy.  (As I would find out, distortion was as high as 8% at times.)

I've tried higher end conditioners (Audioquest, Furman), which helped, but not enough.  So I bit the bullet and purchased a refurb'd Powerplant P12 from PS Audio last December.  All I can say is that the difference was noticable in the first 10 minutes.  The best way I can describe it is "relaxed and smoother".  Which components were positively affected, I don't know, and honestly, I don't care.  But I'm definitely liking the results and am sold on the technology.

I’d be curious to try it if I could get a solid assessment of my power. Presently, things are really quiet on my line, but as the saying goes, "You don’t know what you don’t know."

Paul at PS Audio takes ASR seriously. He doesn't agree with them, but he considers various elements in their argument and doesn't merely ridicule them. Good model to follow. 

I recently replaced a Puritan PSM156 with a P15. I agree with @jeffbij that it is an improvement, relaxed and smoother, is a good description. My goal was to have “Sunday night sound” all of the time, and I am pretty close to that with the P15. I should caution though, it was not a religious experience or a night and day difference in my case, but definitely an improvement and worth the investment in my system.

ASR reviews can be useful in certain cases, but they are only one data point. While their measurements might be accurate, I don’t think their conclusion is valid for the Powerplants. 

Never hurts to find out.  You could always pick one up used.  The seem to resell pretty quickly.  In fact, The Music Room  (tmraudio.com) has a couple of P5 units for <$1600 right now.