KOReader has evolved rapidly, particularly in user interface design, making it easier to navigate despite the extensive features it offers. Users appreciate its capability to track reading habits effectively, offering visual statistics on reading duration per page and overall reading history. It accommodates various reading formats, including PDF, by allowing customization for column reading and screen panning. Despite noted loading time issues, especially with large files, the flexibility and attention to user experience in KOReader are lauded. Users highlight that KOReader transforms traditional reading into a more engaging experience, focusing on user needs over commercial intent.