a bit of an update:
I "tested" the Tolino Epos at a retailer in Germany, and I was pleased with both reading experience and responsiveness in general. It handles PDF files all right, considering the size of the screen. The device feels solid and well-made. Unfortunately, you can't use it to read Kindle DRM-protected e-books but you can buy e-books from any online retailer that offers Epub formats. Apparently, it's made in Germany.
on the other hand...I've come across
https://goodereader.com/blog/electro...-on-aliexpress
and interestingly the Illumina seems to be quite similar to the Lifebook (made in China? same producer as the Illumina?)...anyway, to the point, down towards the end of the page there's a clip about Kindle's responsiveness on the Illumina - and it doesn't look particularly exciting (something to do with the relatively "old" version of Android, perhaps?)...and I'd be a bit worried about facing troubles every time I need to upgrade to a new version of the Kindle app...
I know this doesn't add much value to the thread
hopefully someone can offer their opinion on the Illumina?