Bought PN just to read comics. Conversion to EPUB with calibre was unsatisfactory (incorrect display sizes although Kovid is awaiting parameters to issue PN output). Use of Kobo output with 07_18 firmware was tolerable--less than 5% cut at bottom of page. 07_24 firmware resulted in 10% cut-off at the bottom of the page. Tried a few other outputs starting with Sony Touch since we have those ereaders. No success. Hacked it and installed Droid Comic Viewer (
http://www.robotcomics.net/android-comic-viewer/), and it's showing CBR perfectly!