I had a UD120, but it doesn't play nice with my laptop. Was considering a HiFiME 9018D, but that would be $128 shipped. Any other DACs under $100 you'd recommend anyone? the UD120, Dragonfly 1.2, HiFiME Sabre U2, and idk what else, all use a ES9023 DAC. The 9018D has a sabre ESS9018 as you'd expect. Idk about the sound quality difference though.
HiFimeDIY's 9018D uses the same USB receiver (SA9227) and therefore it will use the same driver. If you have problem with UD120 on your PC, then there is a chance it will run into the same problem with 9018D as well. The ES9018K2M (*not to be mistaken as ESS top-of-the-line ES9018, as K2M is better but closer to ES9023 in performance) inside 9018D is a pretty solid sounding DAC and. But like all the ESS chip, it does sound a bit more 'digital' in comparison to other DAC from TI / Wolfson / AKM / etc.
May I ask what you mean by UD120 ''doesn't play nice' with your laptop?