Greg,after you have had time to burn it in,please let us know how you like it. Fred offered it to me to try,but my wallet is still trying to recover from the TRP,so I declined....for the time being.
Monsterzero,
I think the cable is far enough along to offer some feedback. Just received it Thursday, so am on day 4 with a little over 25 hrs. on the clock. Yes, things have changed already. Context is important, so here is what I'm running:
Aurender N10
Lampizator GG2 with e53 engine and Lampi Copper Caps
LTA Microzotl Preamp
LTA Ultralinear Mono amps
Daedalus Apollo 11 speakers
Tubes in the GG2 thus far are Brimar (GEC) U52 rectifier, KR RK 5U4G rectifier, RK PX25 outputs.
Despite reading about how the Callisto sounds good out of the box, I wasn't overly impressed at first - bright, edgy, forward, and flat. Maybe this was context as the electronics are fast and extended. For dynamic speakers, these new Daedalus are at the fast and extended end of the spectrum too. So, I was really hearing a raw product pretty well. By the second day it was coming around sounding more refined, the edginess relaxing, but the depth and staging were still lagging behind the other cables on hand, especially the spdif input fed by the Aurender. Yesterday was streaming day from morning till midnight. Meaningful improvements occurred throughout when I would stop in for a listen. Much more refined. Now staging is nearly the equal of that through the spdif input. (Aurender OXCO clocks are pretty good so I typically would default to the spdif input when playing PCM - smoother and more organic with wider stage.)
Improvements are reported past 150 hrs. so I'm sure more will come. Already this is the best I've got on hand and I'll be keeping it. The sound is engaging, dynamic, deep, and wide. Notes/sounds are complete from initial attack through decay. I refer to this as grip.
Different DAC's here, but I suspect there is enough commonality in their sound and input for this to be relevant for you. A demo is always a good idea. If I only had a couple hours with this now wonderful cable I may have passed on it.
USB Cables ranked in order of my preference so far: FTA Callisto, Audio Sensibility Signature, Sablon Panatella Reserva. I consider all of them worthwhile, but they are different.