I would like to think that regenerator improves a system but in all fairness most people have electricity sources that do not require it. And therefore it appears to be in most cases a gimmick.
Don’t see Power regenerators at audio shows very often, which is where it clearly should be if there was value in the device with all the Power activity going on with all the related to audio systems. Do see a lot of power conditioners obviously. And based upon response to this thread it would seem many do not know what the before and after impact is.
If it does have a meaningful impact on the system I would be interested but there’s limited support to justify getting one.