Any product can fail, so negative reviews are always statistically suspect. However... I have bought SIX of these (including two of the RCA-less uDAC2HP model), over a period of a couple of years, and TWO were DOA. Also, two of the supplied USB cables were shorted, in one case apparently damaging a PC. (Sensed that the audio problem might be in the wiring when the USB cable got hot to touch.)   When it works: a good entry-level USB DAC, also unusually portable for frequent flyers. Sound quality (to my ears) not quite up to standard of other...