Ugh....from what I read UI look quite disastrous....perhaps it was release too fast. Will adress this issue to Xduoo team and ask about potential firmware update and ask too if it can solve ALL this problems. This is not normal that everybody struggle with the UI, especially taking the fact X2-X3 aren't that bad about it. So, there a comparaison of compenents and features of X2-X3 that Xduoo share me. About returning the D3, I think you can ask your seller before. I know from other DAP I bought (especially DX90) how firmware can be a big problem, especially the first one....they should test it more or use some guinea pigs tester BEFORE puting it on market but well, China is in a hurry, new DAP appear every month, not even a joke! Quite sad to read negative impressions. At least the sound look okay, can we have more impressions about that to? And I wonder if microsd card can be the proble. Did all is perfect when we play music with internal memory???? And positive and negative aspect list will be appreciate! SHould receive mine next week, will try to figure out WTF is about this firmware issues.