The iFi Pro iDSD Signature would be for a second system although I wouldn’t be surprised if it could hold its own against my Totaldac d-1 dual. We’ll see.
All reviewers I know of have "self imposed and rationalized limitations" so you have to pick and choose. Srajan is one of three reviewers I’ve trusted enough to buy on their recommendation and so far I have not been disappointed. The other was Jack Roberts when he was writing for Dagogo. And the third was Art Dudley who turned me onto Shindo gear. I can see how all three of those reviewers share similar self imposed and rationalized limitations.