I live in a rural area. It's free of penguins, so far but perhaps the Polar Vortex will change this.
Each home in this neighborhood of large parcels has its own transformer and the nearest sub-station is about a 15 minute walk. Line from pole to house is buried underground, for whatever that's worth.
The gear I had prior to moving to present location was mid-fi so I can't compare. What I can say is that a dealer/friend brought over one of PSA's top-tier regenerators over here and was quite surprised to hear no audible improvement, whatsoever.
On the other hand, we have the misfortune to be PG&E customers. They fail to adequately maintain their infrastructure, which results in wildfires. Paradise was levelled and our town came within a few hundred yards of suffering the same fate last year. If your only power concern is its effect on your audio system, count your blessings!