if theres a general feedback thread feel free to move this. i just thought id quickly post a few thoughts of my 1 hours with the phone.
Build
The build quality, size, weight are all imo very good. the physcal build of the devices seems well put togeher, no creaking moving bending
the screen is nice, its no carta 1300, and maybe if this is a success a Kompakt 2 will have a higher dpi screen. But its quite legible, and very usable and for the purpose of the device works quite well.
Calls
call quality is also very good. Speaker quality (loudspeaker) for calls was ok, not the best in the world a little tinny, but clear and audible, it doesn’t get super loud but it gets perfectly loud enough for most environments you might use the speakerphone.
i also tested call handover from VoLTE to WiFi Calling and it worked seamlessly without interruption to the call. considering calling is one of the main things for this device, this is excellent. its also very clear on what your using if its VoLTE or WiFi calling.
a note, WiFi calling is disabled by default. you need to go to Settings → Network and Internet → Mobile Network → Advanced → Wi-Fi Calling → (enable) Use Wi-Fi Calling
if yo dont do this, you will use VoLTE indoors which may reduce call quality depending on your signal strength (or if you have signal at all in remote areas 
)
(i dont know if thats in any troubleshooting documentation, it might be good to have it)
Oddities and other things
the internal storage seems sufficient, i dont expect to fill it up, its only 32GB but with the SD card slot i see that as the main storage place for people who might want to use for media / music etc.
the built in apps all seem to work quite nicely
Maps i think could potentially benefit from a custom tile set for rendering. I assume its using the default OSM tiles? but realistically i imagine rendering the various shades of colours of every little thing really is unnecessary clutter on the small eink display. i wonder if it could do with a little optimization? on a side note i cant figure out how to see more information for a POI? i can click them, get the name and type but no other info its cut off… maybe im missing something there ?
an important think for maps is the data accuracy as well, it would be good to see some community engagement maybe to help improve OSM data for mudita customers
for calendar its nice seems relativity functional. it would be nice to be able to upload events to it from the mudita centre app, or to subscribe to a calendar (subscribe to protonmail calendar for example)?
the other apps all seem to do what they say 
it would be interesting if there could be curated ‘community’ apps if anyone ends up making eink / kompakt optomised simple apps
A weird issues. tap/touch sounds is super inconsistent, the volume changes seemingly at random, making is quite jaring. ill probably turn it off but its definitely a bug
touch vibration is also inconsistent, its enabled… but only works on the hardware keys? no vibration on the screen except using the keyboard, this is inconsistent with the setting…
Mudita Centre
works nicely, but it seems like a lot can be done here to make the kompakt even better. exporting photos (i can see them but cant export them?), ability to upload calendars etc. MPT support perhaps? (though MPT can be buggy in general) it seems like improvements here could make the phone much nicer to use with our other technologies without breaking the purposeful goal of the phone.
overall, its very nice so far. a little getting used to i expect.
i might just add more here as i come up with more thoughts
you can add files to the phone
