Harry Pearson, although not stating whether or not he has tried other fuses, states on his website, hpsoundings.com, that he uses the HiFi Supreme fuses. Of course, this doesn't mean he's heard the Synergistic Research or the AMRs. I bought a couple of the Synergistic Research fuses, but got the wrong sizes, so I have to send them back and exchange them for the smaller, slow blow, 10 amp size. I have the WA Quantum chips on my HiFi Supremes right now, but since I've already paid for the SRs, and they have a 30-day trial period, I see no disadvantage in trying them.
I do wish HiFi Tuning allowed a "test drive," but they do not, even if one ordered the wrong size/fast blow instead of slow blow, etc. I've had my HiFi Supremes for a year, so it should be easy to hear the difference between them and the SR fuses.