Just to add i have let mine update now, and there was a further update (.54 I think which is the latest update) and all has been good. Been a bargain, very happy with it, no issues.
The white one came today for the girlfriend, pretty much similarly set up to match mine but without the update to android 7.1.1. One thing I did notice was when a call took place on hers, the screen would go off which can make things tricky, it was like it was screen locked to off ... After a few tweaks to settings, couldn't work out what was causing it. Mine was fine but had been updated to 7.1.1. So in the end I just updated hers and it fixed it. Worth knowing anyway. Other than that, yeah screen gets warm but nothing else obviously bad at the moment
Link to the xda thread on.. 160 update... https://forum.xda-developers.com/z5-compact/general/android-7-1-1-stock-32-4-0-160-bug-list-t3632524/page11 On last couple of pages seems to be that folk have a couple of cures if any issues (it seems fifty fifty whether people do or not) Disabling the movie creator app, and also doing a factory reset after the update seems to help if having issues. Anyhow, really liking this phone, very nice
Ah don't think i have time to get involved with all that sadly. For what it's worth I've found a fault, albeit very small. On a white background I can see one pixel a slightly different shade of white, it's fine with a dark background. Noticed it when running diagnostics... Not major and will see how it goes
Flylife probably will still be okay, and I think there is another update either coming soon or available now (.54). Anyhow, incase folk don't know, xda is a good resource for such info, and also for custom.roms, etc... https://forum.xda-developers.com/z5-compact/general