I cannot comment on the Sony devices, but I own both a reMarkable and an Onyx Boox 2. I don't use either to read epub books (I am myopic, but still prefer reading epubs on a smaller devices); but I've used both to try and read PDFs, which smaller size ereaders don't deal too well with.
For weight, I'd say the reMarkable is light enough to be comfortable to hold for some time; the Onyx is a bit too heavy for that to feel really comfortable.
For reading comfort, the larger display size of the Onyx is really significant; it allows me to read full-page PDF magazines (with rather small font size) or other full-page PDF documents, with absolutely no problems. But then, whenever I am reading for a long time, I tend to not hold the reader in hand; I'll instead lay it flat on a table, or on some kind of surface.
Whenever I read about the hardware of the Sony device, I think it's really too bad that they only ship it with software that won't let the user work the way he wants - a complete deal breaker for me. The Onyx is a very nice device and I'm happy with it, but a similar one with the Sony hardware (and lower weight!) would really have been sweet.
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