Got the Blacks for my DAC/pre in the mail yesterday. VH Audio shipped fast. Out of the box, the sound was a little muddy and indistinct. After about six hours, I had a listening session. The mud was gone and leading edges of horn notes had a nice bark to them, but overall I felt I was lacking the harmonic and overtone development that I had enjoyed with (burned-in) stock fuses.
I still retain great hope that these things will rebound with burn-in. I won't be able to listen again until Tuesday night, at which point we'll have about 125 hours.