My DX50 IS NOT defective due to hardware it's defective DUE to bad software implementation. If you check the last 10 pages or so on the DX50 impressions thread you will encounter various posts sprinkled throughout the thread of people stating their DX50 is buggy. Their problems seem to range from slow UI to full lock ups and freezes to volume spikes to tag reading problems. Some of these problems I have also experienced albeit the newest firmware has eleviated my problems to the point that it's now functional enough to get by. What I mean by that last part is my unit is still problematic when it decides to be.
As for the sound quality, the DX50 is slightly better sounding (and I emphasize ONLY SLIGHTLY BETTER SOUNDING) then a standard iPod. If one is going to spend 240 only to be forced to spend another 2, 3, or 4 hundred bones on an amp to make the DX50 sound like good hi fi instead of mediocracy then I say buy a better sounding mobile rig or DAP and leave the DX50 with iBasso.
Finally, if certain people don't like the idea that I spew negativity involving the DX50 everywhere I go then I shall gladly keep it to myself on the condition that my user name NEVER EVER BE BROUGHT INTO THE CONVERSATION. When it is I SHALL SPEAK MY MIND and post my opinion and experience with the DX50 and if certain people dislike that TOUGH. Considering I've had problems involving certain individuals flaming me I will thank everyone to PLEASE KEEP MY NAME OUT of any DX50 conversation. That shall be all. Have a nice life.