The hiby r6 and hiby r6 pro are 2 different devices. Since you tested the pro, best to reference it in the review so people don't get confused. Especially since you quoted the price of the unit you didn't test.
The r6 pro is $550 in aluminum, $700(launched at $800) in stainless steel on Amazon, and is $800"in lilac purple, from the last time I looked.
Just a heads up so there is less confusion.
Wish we had seen the tests for the balanced output more although this still is bad testing....
As that other user said... They were literally designed for this... What the hell.... You're better off just attaching the E1DA (because your phone won't output bit perfect to all applications like this device will) so you actually get good performance...
Edit:
@amirm how does the E1DA do when you test it connected to a phone or this device? Since really it seems the E1DA as dac/amp and another device as transport seems to be our best bet.