Regeneration has be around for sometime think Accuphase.
If I remember correctly ML actually regenerate power in their bigger power amps.
All PS Audio has done is to fix the problems their previous Power Plants had. There are other players out there (ExactPower, PurePower) and the jury is still out on whether regeneration (total or partial) is the best way forward. Shunyata still believes passive is best and surprise surprise PS Audio also has similar products working much like the lower end Hydras as well as products for balanced power. Do take note that regeneration has limits when it comes to big power amps.
In the end it all depends on what works best for your own system given your power problems or lack of.
If I remember correctly ML actually regenerate power in their bigger power amps.
All PS Audio has done is to fix the problems their previous Power Plants had. There are other players out there (ExactPower, PurePower) and the jury is still out on whether regeneration (total or partial) is the best way forward. Shunyata still believes passive is best and surprise surprise PS Audio also has similar products working much like the lower end Hydras as well as products for balanced power. Do take note that regeneration has limits when it comes to big power amps.
In the end it all depends on what works best for your own system given your power problems or lack of.