For me this fills a pretty interesting niche. If your device is very open and already lets you do whatever you want, koreader will seem really bloated and annoy

For me this fills a pretty interesting niche. If your device is very open and already lets you do whatever you want, koreader will seem really bloated and annoying. But if all you can do is install "apps", then you can just install koreader and have access to everything you would probably want a custom OS for, such as SSH. And you can have it all without voiding your warranty or modifying the firmware in any way.