'I've not seen any SW bugs on the Y-Ben P47L, but there are at least two versions, earlier one is matte surface and later one has a soft shiny film that doesn't come off even after dissassembly'
Mine was the earlier one
'A 2.9″ screen sounds a bit small'
I've read half a novel on it in the last day and it's fine for me. But I like small ereaders
I think the P47L screen size is my sweet spot.
'I'm tempted to get it for testing that our images in epubs work on a smaller than 4.3″ screen'
You can open images on it, but not epubs (only txt book files). This is similar and opens epubs:
https://www.aliexpress.us/item/32568...d=9dz1UAwPxdte
'Are you sure it wasn't designed as an in-building text pager? Like can you push text to it over WiFi to automatically display?'
Not that I'm aware of. It's marketed as a weather station, clock, and reader. I'm not interested in the first two.
'If it can do large Chinese text it's maybe meant as a badge!'
It's too thick IMO and there's no attachment. There are much better e-ink badges on AliExpress.