I bought this interface last week,so can make some review here.
 
Arrived cheap carton box,but the chassis full black aluminium,simple wonderful.
 
Test with:
Scan speak illuminator monitor speakers,audio gd M10 monorual,Nos7 ocxo ,singxer su 1 ,intona industrial+lt 3042 output side powered,silver usb AB cable,Qa 660 sd trans.
 
Yes,inside the raspberry 2!!!!Understand the price now ,only 1000Rmb on taobao,But in Germany around 500Euro!!!!!
 
 
The sound:
 
1.   x5+singxer   sound crappy
2.   x5+intona +singxer  little better but crappy
3.   x5+intona+singxer+silver usb more better but crappy
4.   x5+intona+lt3042 ultra low noise power 5V+silver usb  wow!!! its good now,
5.   x5+intona+lt 3042+silver usb+  audio settings buffer disabled   Really good sound!!!
 
Wide soundstage,enough microdetails,transparent airy sound.
The original smps power really good,i trial with linear and battery power,but not better.