I bought this a couple of days ago from Amazon (UK) and can only repeat the other comments - good and bad. The sound quality and amp are of a very high standard and astonishing for the price but the USB cable/connection is really poor and feels flimsy - the build quality is much worse than the Android mini DAC I also own.
How to resume my impresssion!!!
forget the 9023.
Using this one, i discovered a new time all my music and i find it even better that the asynchronous 9018.
The sound stage is so detailled.
I'm french and with the help of this one, i can now catch so easily nearly every english word unless it was so hard before with the Dragonfly or the 9023.
I use it on my raspberry pi with an iphone 1A power(the 5V source with lowest noise i found) using mopidy and the experience is so good now that i can't imagine something sounding better.
I have this great little DAC for a week now and the sound is simply great. I use it with a vintage amp and my self designed and build speakers, a tree-way (Visaton RHT12S, Dynaudio D54, Vifa 21wp250) large floor standing speaker. I have no experience with high level DAC's because i used my Sony H855TV dac.
The improvement is huge and the sound, witch already was good, is of a other level. The sound became more alive, dynamic with a deep soundstage and lots of tonal detail, separation and musicality. Good recordings sound great, less good recordings more flat then before. My wife thought i was using other equipment ;-) and i showed this little simple black box and she was stunned about the difference. Great job, Hifimediy guy's, thanks for the great product!
Moved up from the Fiio K1 to this....... I cant believe i wasted my time with that. This makes the K1 look like a toy. Hifime did an amazing job with this. Seriously, this beats my desktop dac/amp combo... bottom line I am a happy customer :)
A big THANK YOU! Thank you for your passion and for your hard work - this DAC rocks.
I have the ES9023 as well but this one sounds much clearer & crispier and makes Monitor Audio BX2s vibrate just as they should with a Marantz PM6004 amp.