Looks like a worthwhile article. But it can't really be used to judge the value of ground boxes. To do would be analogous to judging an amplifier based solely on its specs.
To Electroid: Since you use a system with the grounds lifted, I hope you will try The Synergistic research Grounding Block as it has a money back policy.
You are the perfect person to do this experiment with one of these ground conditioning devices
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