@lpretiring there are countless posts on various forums about 'power line conditioners', 'power line filtering' devices, to include the one I mentioned. They all perform the same function, and they all make the same claims, and they all make same/similar demonstrations with same/similar "reduction" in AC power "noise". These devices have been around for decades, and they all perform the same function to varying degrees of efficiency and varying degree of effect. So, you can spend $200, or even $2000 and likely higher on a gadget that does the same function of a $35 gadget. Maybe the materials are much higher quality....maybe that in fact makes a larger "impact", or efficiency, or SAFETY.......maybe that "impact" is audible....maybe that is worth the cost of the device.
For me, I would try something cheaper first to try out, listen to hear if there are improvements and get some scope tests done to see if at least it is "cleaning" the power coming from the wall, before I would drop $200.