I agree with Spacer. I have just commented on another thread that there is a loss of tone color when, just to improve it, I bought 5 fuses for my NAD C325 BEE integrated. I initially thought it clearer, but I also noticed a thinness to the sonics overall (another poster said it increased the "3D" sound, but that was not my experience in the NAD, which is itself weighted towards the midrange and bass. I had thrown away the stock fuses, so I bought a pair of Synergistic SR 20s, took out two of the Furutechs, and could immediately distinguish oboes, clarinets, and certain types of trumpets' tonality (Herb Alpert uses a different trumpet than Al Hirt) quite clearly.
So, the Furutech, while good, might lessen mid bass tonality (and upper bass, too). It's a good idea to hear live instruments instead of just recordings, because it can fool you when the sound changes in ways you don't expect, and even I have initially lauded a product only to realize later that it DID do what I thought, but it lessened some other qualities of live music. Tonality of instruments (including Aretha Franklin's voice, Ella's voice, and Nina Simone's voice) changed with the Furutechs as well: not as "human-sounding" as when I put in the new Synergistics (and I have both the SR and the Red fuses, as well as Hi Fi regular fuses as well as Supreme, and several other audiophile fuses, which I've used in my Hurricanes, PS Audio Power Plant and other applications) and the effect is clear. So, the Furutechs might clean up the sound, but I think there is a reason that the Furutech Gold outlets are being used in that $5k line conditioner HP used last (the manufacturer chose the Gold over the Rhodium). I had both, but chose the Rhodium, because it was more "forward" and "immediate" sounding. Now I'm wondering if, just to play Devil's Advocate, I should put back in my Synergistic Research outlets or even my FIMs to see how the sound changes tonally.
So, what Spacer said sounds correct to me. And I have a LOT of Furutechs: outlets, outlet covers, fuses, and my Nordost Brahma has a Furutech connector on it, too. Hmmm...