Comment by trashb

You can sideload books on Kobo over USB they parse the expected formats epub/pdf/html without problems. There is custom firmware available and a homebrew app community.

I find their default interface is also good and can read anything without mayor problems, books, web & comics. My reader Elipsa 2e is also great for taking notes and supports notes in book pages, though that specific model isn't supported by the custom firmware.