Have had the SR25 for about 2 weeks. After the initial 'new toy' joy has worn off, I must confess to becoming a little disappointed. I come from medium to high-end USB DAC experience (W2, S1 and S2, S9, Pee51, etc.) and I wanted to try the SR25 as I loved the A&K Pee51 DAC, but wanted something with substantial battery life. I was also expecting at least a marginal gain in sound from the SR25 over the Pee51. After much A/B-ing between the two, if anything the Pee51 has the better sound (flac lossless/hi res through UAPP to W80s). The SR25 has a thinner top end which can sound rather too fragile; the Pee51 is both prettier, fuller and more analogue to my ears. Balanced output didn't help. Also, the only app that I could get to work properly on the SR25 - e.g., a swift UI experience, effectively downloads a massive library, and plays in hi res - was the Apple Music app, which exacerbated that thinner top end compared to the native player or Qobuz. So the SR25 is being returned, which is a shame.