Any manufacture or dealer that offers a 90-day no questions asked return policy is okay in my books. Why trust the marketing spiel when you can try it yourself.
What’s your vote for the most ridiculous, overpriced, and useless tweak?
My vote: Furutech Outlet Cover 105 NCF $220, with “special crystalline material that has two “active” properties.” https://www.thecableco.com/outlet-cover-105-ncf.html