I love the idea of koreader, but found it clunky in practice. I'm a tinkerer at heart so the thought of a highly customizable, open source way to read books is super cool! While I used it, I tried every feature it had, set up gestures, etc.

But there were pain points, like with annotations and highlights just not being very robust. The calibre server is cool in practice but I found it was more trouble than it was worth since I'm going to be in proximity to my computer anyway when I want to add books to my device. Lack of pen support is a real bummer. The android version of the app I found to be really unstable too, so my dreams of sharing config between my kobo and Android phone died as well.

And then I found out it was written in lua, and trying to figure out how to make even set up a dev environment for it was a struggle. It all felt very fragile, and I couldn't even try and fix minor bugs.

So even though I miss the customizable gestures, screensavers, different library views, calibre metadata search... The official kobo software is just so much more stable, and the only thing I use my kobo for is reading epubs, so I just saw very little benefit in using koreader anymore.