Many thanks to all for sharing this information. Just installed koreader on my KA1 and my Kobo Aura. And I'm not exactly technically savvy.
Wow! Kind of wish now that I hadn't given away my Aura HD. Suddenly reading PDFs is a pleasurable experience.
Would still like a 13 inch ereader with decent specs put out by a reputable company. However, in the meantime, this will suffice quite nicely.

