Power regenerator vs conditioner

More or less.  The one cool feature some of these are now adding is high noise suppression for the ground wire.

The negative part of regenerators is cost and efficiency.  Some power will always get lost between the AC/DC conversion, storage and AC generation.

A simpler and effective approach would be a BPIT. balanced power isolation transformer. It’s a big ass transformer that runs cool, provides CMR, common mode rejection which cancels out noise and provides isolation from the mains via windings. I’ve had great results with the equitech Q model and the core power units which are lower cost but yield same results, IME 

@craig - I agree with you in that you would think regenerated "perfect" AC would be the better choice, yet so many audiophiles seem to go with the passive conditioners and I'm not sure why.  I myself have an Audience conditioner, which I like very much, but I've never tried a Power Plant.  I don't think cost is the issue as the better conditioners are at least as expensive as the power plants.