The PurePower regenerators with the battery backup were the last of my attempt at clean power where there was no problem to begin with and it was my pinnacle system with highly resolving components and speakers.
The battery backup of the PurePower regenerators was a nice feature but sonically it did nothing for my system.
My Richard Gray's are still with me. They don't do anything for the sound but the extra outlets are very handy and it is an isolation transformer FWIW.
