I've got three dedicated lines coming into my audio room on a rock-solid power grid (we share the grid with the county's emergency services). I thought power solutions never offered much improvement in my system (Fleetwood DeVille, Backert Labs Preamp, McGary amp, Merason DAC). That is until I demoed the Puritan PSM1512 (12-outlet version of the PSM156).
I was stunned at the difference. Everything was clearer and better delineated. The pace seemed to pick up and the sound seemed more "alive". The sound stage was wider and deeper. Honestly, I was stunned.
In my other system (Volti, AGD, Technics, HiFi Rose) I swapped the Puritan in for my IsoTek EVO3 Aquarius (both using a Transparent Premium PC), and again, the difference was pretty staggering (and really obvious). I would attempt to demo a Puritan before you commit to anything else. It's by far the best that I've ever heard in any of my systems over the years, (but, to be fair, I'm not auditioning $10K power line solutions).