I can vouch for the Synergistic fuses, I was skeptical, put one orange in my amp... Then I had to do every fuse, my preamp, my DAC, my streamer now all have SR fuses. Some really good snake oil that adds warmth, analog, real sounding performance value.
Now for the rest of my life I'll have to always buy these things because I couldn't have a 50¢ cheap fuse be the weak link in any component going forward...