I have a 5" Sony PRS350. It's quite good for out and about. However a 6.8" or 7" seems best at home. Bigger gets a bit heavy.
I've simply switched to a coat with larger pockets to be able to take 7" Kobo Libra rather than the 5" Sony PRS350 out.
I can't see a market for a 5" ereader unless it was less than $25, because over half of eBooks are read on a phone. I sometimes read on my phone if I'm waiting for a Take-out.
The 9.7" Kindle DGX was far too heavy. My lightweight Lenovo 10" Android Tablet is great for technical PDFs, but too heavy to read a novel on. The Win10 10" tablet was worse apart from being too slow for many PDF scans of ancient magazines or books. The 7" 300dpi does let a lot of modern PDF manuals that are about A5 size work well, far faster and easier to read than original 6.8" Kobo H2O. The 6" Kindle PW3 is too small for almost all PDFs. I use it simply to buy Amazon ebooks, which is a tiny percentage of my reading.
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