I had the Ultra. Its preamp / DAC is good but nothing to write home about. Currently, I use it as a dsp to do RC/PEQ for my CD rig in the 2nd system:
Mxn10 (coaxial; Belden 2964 75 ohm) --------------↘
CD player (toslink) -> Ultra (usb) -> DDC (I2s) -> Topping D90 iii Discrete (xlr 5V) -> Cambridge Azur 851a -> Burchardt S400 II
A DDC is inserted after the Ultra to enhance the transport's sonic quality, making it comparable to the MXN10.