This is not mine so I have to send it to the owner. I just got the chance of a brief listening. This DAC was really good for those have no skill/time to DIY.
Compared with single 1021 w/ uber buffer fed into balanced CFA, uber has better sound stage and dynamics. 1541 has some more detail and sounded airy.
The front panel is a convenient feature so changing digital filter and xfeed are much easier than DIY ones. The chassis however, was solid but compromised on finishing. It looked cheap. For a DAC now 1290 Euro, and made in Denmark, I can't expect it having a much better look though.
The main issues here IMO, are
1) the performance of buck+LDO. I personally prefer some traditional way like transformer+ultra low noise linear PS.
2) the performance of the output buffer. It has only +-12V ps. But should be plenty for the output. It has different PS for digital and analog rail.
The 1021 DIY module drive 5V digital parts form analog rail. Which was somehow compromised, too.
So people have to choose form better buffer like Kevin's diamond buffer and some real ultra low noise LDO or isolated PS for digital/analog.
PS. the OP based balanced buffer on 1021 is utterly shit. Use raw output and some better buffers.