The HA INFO U2 PLUS USB DAC and Headphone Amp:
The specs are impressive especially for the price £45 ($70):
TENOR TE7022L USB reciever chip
TPA6120A2 Headphone amp chip
Nichicon Muse caps
Alps volume control.
The first thing I did on receiving the DAC was to change the op amp from the OPA2604 (not one of the best) to OPA2107. I would encourage anyone who buys the DAC to change the op amp as soon as possible. I will try...