I have had my DAC-60 with Sonicraft mods for about 1 week now. It is wonderful sounding. I have been rolling tubes, including the Amperex 7308 PQ white label, Siemens CCa and even Telefunken CCa. The more expensive tubes sound better. They should given the cost.
I am driving mine from the computer with an Off-Ramp Turbo 2 with S/PDIF captive cable. Very close to my Benchmark DAC-1 with mods, but not quite the level of clarity. Dynamics are superb with the Siemens tubes. It is not really a "tube" sound. more like really good SS IMO.
I plan to do a number of my own mods to the board next and then roll some different coupling caps, including V-caps, Sonicap Platinum, and Penta-caps. All Teflon caps. Then I will be installing an I2S interface and USB interface. This should bring the jitter way down. Dont know if it will pass-up the modded Benchmark DAC-1 with I2S interface, but it is showing a lot of potential.
BTW - I'm also using Herbie's Halo-9 with PEEK dampeners for the tubes.
I've also modded some of the DIP's. They do make a difference, but if you think this is low jitter, you haven't heard low jitter yet....The Big Ben is much better. I dont need any of these jitter "removers" because I dont have the jitter in the first place.