A few words on my experiences using the DigiBUSS.
I have the DigiBUSS circuit built into a customised MiniBUSS with a defeat switch, making comparisons very easy.
After giving the MiniBUSS several weeks burn-in period with the DigiBUSS circuit engaged, I disengaged it. Suddenly there was an added tizz, a flattening of the sound-stage and image depth, and an added quality to the music that made it seem less natural. All this was quite obvious, though not dramatic, never the less detracted from the listening enjoyment quite significantly, and I soon had to switch the circuit back in to resume my listening pleasure. I found what I heard quite surprising, as I was expecting something much more subtle, and all this after the MiniBUSS and two of the excellent LessLoss Firewall Modules, which together made a substantial improvement!
So, for the price of an inexpensive tweak, Dave offers a very worthwhile addition.