I charged mine with my usual usb charger but the battery overwhelmed the poor thing in no time (I haven't even noticed because my old readers where pretty low key on battery power). I then used a fast charger (matches the rating at it's lowest 2A/5V). Battery is otherwise fine on mine at least.

Default Notes App: lol, handwriting recognition is way too off (spitting out some gibberish all the time) and it takes quite some time not that I care much about this feature

Default reading app is fine I guess (tried only reading so far but I will try taking some notes later - mostly on pdf musical sheets and using Bluetooth pedal for turning pages - will see how that goes )

You will probably want some extra screen protectors because, yeah no way you will get it on without some kind of screw-up. No bubbles on mine but protector doesn't stick on one end (a millimeter too close to the edge ). Fine looking matte protector otherwise.

Case is ok, sleep function works.

Tried Moon+ Reader, Tachiyomi, Firefox - usable and working smooth.

I installed an 128GB SD card and it recognized it immediately.

So far only the system update screen is really annoying. I think updates via WiFi are broken. It's always doing that connecting, retrying, failing thing and it takes forever to change between those statuses. The update is supposedly only ~6MB so what in god's name is it doing all that time? I will probably just install the updates from local files if I find them online. That should work right?