I don't think there is any 6" reader that is good for reading scientific two-column PDFs. You can do it, but it's no fun. You also brought up annotating. PocketBook devices allow you to annotate the PDFs, but it is in a proprietary format that isn't really portable to any other program out there. The annotations are designed to only be read on the device. So, you either need a larger ereader to read those PDFs, or use the 6" model for reading fiction and get a tablet for the papers.
P.S. I used to buy my PocketBook devices through a French webstore (Canada is considered to be in the Francophone region), and the shipping prices were reasonable. But the one French store left now (maliseuse.com) seems to be down for maintenance, and I don't know if you can buy ereaders there anymore. As you say, buying from other European shops can mean very high shipping costs.
Last edited by rkomar; 03-23-2017 at 12:07 AM.
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