So instead I spent a little more still to get the new PocketBook Touch HD, which as the name indicates has a HD display, is faster with twice the memory and can play audio. My preference for PocketBook is that I want to be able to use my e-reader without having to register it anywhere or be associated with any store. PocketBook offers a cloud backup and synchronization service too, but you can just skip that. Also it supports the Adobe DRM my public library uses.
One thing that made me apprehensive is that while most reviews liked the hardware they cautioned about bugs in the firmware. Some reviews also claimed that it stopped working entirely when they tried to update said firmware, but I put these down to inexperience in coping with technical difficulties.
I was already familiar with how horrible and glitchy their firmware updates are from my previous PocketBook, but they also offer multiple ways of troubleshooting, restoring corrupted systems and their support is decent.
And true to form the thing hung during the initial firmware update, but actually it resolved more easily than last time. After a call to their support line, it took only one reset and connecting the e-reader to my laptop during the update for it to finish correctly. Apparently the thing likes to be connected to a power supply while updating, and may hang if it is not, even if it is nearly fully charged. Only the manual doesn't tell you that. (I was clever enough this time around to try this during their office hours, whereas last time I tried over the weekend and only got an answer to my, then slightly different, problem via mail on Monday, when I had already managed to resolve it with a lot of trial and error.)
Anyway, once I was past that (and disabled automatic updates), so far it seems to work okay when I tried stuff, though some problems might only show with longer use. I mean, my previous one has glitched a few times with books for no reason I could discern, like it would sometimes not display a page but exit to the menu, even though when I checked the ebook source code in that place on my computer I could never see anything unusual (like broken formatting or code or such) that might explain this. It wasn't happening often, maybe half a dozen times per several hundreds of files, but still annoying. And a few times it crashed for no reason, so even picking the old one again I would not have been bug-free.
The HD display of the new one is noticeably nicer and crisper than my previous one, and it is faster when loading things, when browsing the library and when reacting in general. So that is very nice. It connects fine to Calibre (though the translation of Calibre tags into "genres" is not ideal for my use of tags in particular with fanfic), and its own library organization got even better than previously.
Anyway so far I'm happy with it.