@teajay - Another good review!
I've never understood why anyone would want tubes in a DAC, though. That's what tube pre-amps and amps are for, as having tubes in a DAC hamstrings the DAC to one sub-set. If one wanted to go all SS at a time in the future, their DAC is now worthless. But, if like most DACs, that don't employ tubes, if you want to go tubeless, then just change your pre-amp/amp.
In my mind, at least, it limits the DAC. I used to own a Lampizator Golden Gate at one time, and I couldn't get rid of it fast enough.