I owned the ADI-2 DAC for a little under month and boy that was a remarkable device. I retuned it, but not for reasons related to quality or functionality. Navigating the menus and saving presets needs a little bit of learning, but that is normal in my opinion. The bigger problem is that once you get one... you may want twoDo I just give up and stump up for the RME ADI-2 DAC?