My initial impressions after a few hours of listening are overall positive, but… I’m not sure if I can recommend the burson V5i-D upgrade. There is definitely a sound change (subtle as it may be), but since swapping an op-amp is not quick or something one should do repeatedly, it’s hard to A-B test so I can’t really put it to words yet. Maybe “clearer” if I had to try. I’ll probably swap back to the stock op-amp in a day or two and see if I notice anything more identifiable.
What I can say for certain is the V5i-D has some “quirks” to it. Is seams to drain battery faster (which I was aware of) and it pops when turning it on/off or plugging/unplugging headphones. Neither are a huge deal, but they aren’t good things either.