1. Tries it and likes it
2. Violently opposed to it, has to insult anyone who says they can notice a difference, does not try it.
It would be good to have the designers view on what led him to the design of the mat and what he thinks it is doing. I presume it’s similar to other products by Bybee, SR and Akiko which work by absorbing RFI and EMF. I wonder how these mats can be selective and not also absorb some of the musical details? My experience with Bybee is hit and miss, it seems not to be good in some places and better in others. Akiko make some just for mains and consumer units, which look interesting and I suspect is the right area for these “absorption” products.