I upgraded to a second generation Fiio X3 after owning the first generation for over a year. Here is my feedback after six weeks of use: Sound quality is slightly better, more refined/sophisticated sounding than the first generation. Subtle details are placed better in the soundstage, but as others have pointed out, the sound is not as "sweet" as the first generation. It's a fair bit quieter, with a bit more nuance, and a better sense of space. I suspect that this is because of the built-in amp, and not the DAC. Unfortunately, this is where the...