@boostedis If you buy a product that provides surge protection then that's exactly what it's going to do but you shouldn't expect sonic improvements, you may even get a small degradation due to current limitation. It's not a leap of faith or hocus pocus but a scientific insurance policy against power grid surges. I doubt they offer much protection against lightning strikes.
Power conditioning is a different animal which endeavors to ensure enough current delivery whilst maintaining the correct voltage, and in some cases smoothing the sine wave and rejecting dc pollution of the system, among other things.
Again no witchcraft or unmeasurable cable non-science is involved, all these things can be scientifically measured, or physically observed in the unit.
However some are going to sound better than others for various reasons which probably can't be measured on an oscilloscope.