I doubt these conditioners would make any difference in the sound or image
of your system, but they can protect against such things as a tree falling
on a power line and destroying several thousand dollars worth of equipment.

You don't need an expensive "conditioner" to get this protection. Buy a
couple of surge suppressors for your electronic equipment, plus an SPS
(incorrectly called a UPS) for your computer, so it won't crash during a
power outage.