I did this switch a few months back when Readarr really started to fall apart on me. Booklore has been excellent for my normal ebook library, epub, and a few pdfs. The exception being larger comic files which I find it struggles with. I’ve been using it directly connected via OPDS and it’s syncing service to KOReader, and it’s been awesome.

Overall, I highly recommend Booklore at this point!

I’ve currently got progress syncing through Calibre-Web-Automated, but I’d also tried it via KoInsights which I’m using for syncing reading stats. I’m in the process of migrating to my library to BookLore which also has a sync server.

I’ve been synching progress and stats between a pair of devices! It’s been great since it runs well on my haul broken kindle & my android.

There is some(maybe a bit more than some) setup time to get used to the layers of menus, but it’s a pretty robust app.