I haven't got a dx50 yet. Just following the comments from the owners here on head fi and, so far, everybody seems to be happy with the SQ.
.......however: am I the only one to think why on earth at iBasso's they couldn't come up with a better or more "elegant" or "integrated" solution than just print VOL, Hold....etc on the screen?
That isn't printed on the screen, it is the screen protector that is used for shipping and demo and has a tab at the top right for removal. There is nothing printed on the actual screen.