I don’t really like having to convert EPUBs to mobi. I have had issues with Calibre breaking formatting back when I used a Kindle DX in like 2011. I am sure it’s better at conversion now, but it left a bad taste in my mouth, so I like being able to immediately drop the EPUBs into a custom folder and point KOReader.
Additionally, KOReader is pretty nice in its own right, like being able to use any arbitrary TTF font and custom sleep screen images and wireless sync with Calibre.
It was admittedly also just a fun thing to do on a Saturday since it was so easy. I ended up jailbreaking my wife’s and sister in law’s as well since once I figured it out it took like twenty minutes, most of it just waiting for reboots.
I use Amazon's conversion tooling rather than Calibre (first kindlegen, now amazon.com/sendtokindle), and haven't noticed any formatting issues - and the website gives me wireless sync support too. No arbitrary TTF support or custom screen images, though.
Well one of my Kindles is actually a DX, which can only communicate via 3G which has long been shut down, meaning that the only way to send books to it is via USB, so I don’t think the sendtokindle would work with that.
I also wouldn’t want to use a cloud service if the books are obtained from an, uh, “unofficial” source. Again, not that I would ever do that, because that would be a crime.
Additionally, KOReader is pretty nice in its own right, like being able to use any arbitrary TTF font and custom sleep screen images and wireless sync with Calibre.
It was admittedly also just a fun thing to do on a Saturday since it was so easy. I ended up jailbreaking my wife’s and sister in law’s as well since once I figured it out it took like twenty minutes, most of it just waiting for reboots.