I have no experience with the Libre, but personally I think there are several significantly better 5" devices than the Sony PRS-300, such as the Pocketbook 360 (my personal favourite), CyBook Opus, and BeBook Mini (AKA Hanlin V5, Astak Pocket Pro, etc). All these have full folder support, which is much more useful than the "Collections" of the Sony, and works equally well with Calibre.
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