I've had this DAC/Amp for about a year and a half at this point, using it almost every workday for 4-8 hours. After dealing with really annoying Windows/USB/Driver issues with other DACs, I'm happy to report that I haven't had a single issue with either the XMOS or standard modes. Sound-wise, it's also phenomenal; I have it paired with the Fostex TH-X00 and nothing makes me happier than listening to that combo.