I've been really surprised by what modern engineering can achieve is such a small package!
I've seen the measurements, read the details on construction and electrical design of this dongle, and been already impressed. When i finally got the device and just compared it to big professional DACs i use at studio...man, that was really astonishing, it is really on top level of quality audio reproduction.
It was a surprise, especially comparing it to very expensive big converters of yesteryear, but then i thought - man, my phone is much more powerful than my PC from 2005, and it is much cheaper too!
So, that's a real explanation - the technical progress is still really big, and it came right about time to high fidelity audio. Congratulations!
Highly recommended, despite it is not so easy to plug to phone (need special cable and/or external power), but - no hassles, no audio-related drawbacks, ultra-high audio quality.