The Entreq boxes are effective tweaks- they have a beneficial effect, noticeable but subtle. If they cost less than a major component upgrade, I would say they are worth it.
I wouldn't name the product. A well known friend open up 1 of the well known product & discovered that it consist of a brass plate covered with some kind of sand . I have it & it works fairly well with some equipment . I have a friend who DIY with many brass plates & it works in his syst !!! Another expensive ground box I have seen a photo of it . 2 rods with brass rod through it & connected with 2 wires !!! & non of the connecting rods is isolated !!! Funny thing is that I have personally heard of demo with this product & it's eye popping - seriously effective . I m so tempted that I wanted to buy it . However couldn't agree with the price . Another product u can try is from Telos Taiwan which came out with an electrical ground box where every terminal is rated zero ground potential . I have heard it . Fairly effectively
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