So, what is the theory behind the improvement and does it have much bearing on whether power conditioners/power cables are snake oil or not?
Switch mode power supplies are small and noisy and are optimised for a particular load.
Linear power supplies are large and inefficient but are smooth and handle fluctuations in load easily.
SMPS = 1400cc turbo engine with a race cam producing 200hp
LPS = 3500cc NA V8 producing 200hp
In an all digital set up it could be argued that it shouldn't make much difference. G68XXV owners should be looking at this for an upgrade though.
All the best,
Steve.