ZS10 Pro - Two weeks in
... or around 300 hours of playtime/heavy burn-in with things starting to really fall into place after more than ~200 long hours.
Some days ago I still preferred my ZS7 over the new 10 Pro for pretty much anything other than EDM. In the meantime I kept rolling cables and tips and finally settled on a white 8-core Jcally cable, my standard wide-bore double flanges and some bi-color standard tips that AFAIR came with some KZs for a less bassy more balanced sound.
Switching back and forth mainly between those two sets for the last few days I suddenly found more and more songs that I actually preferred through the 10 Pro. It started with some R&B, then suddenly some latin vibes sounded more pleasing than before and now there are even some acoustic jazz and fusion tracks that I enjoy more through the comparatively more balanced and relaxed sounding 10 Pro but of course a lot depends on individual recordings.
There are still some subtle issues with the timbre of acoustic pianos, tenor and alto saxes and some other natural instruments but nothing really annoying, especially considering their low price. OTOH the 10 Pro have the most natural sounding highs and treble of any of my KZ IEMs and after those 250 hours have become some of my favorite KZs, next to my trusty ZS6 and ZS7 - money well spent - after all.
PS: does anyone have any issues with a sharp spike around 7.9 kHz on their ZS7? Just curious.