It reads comic book files alright I guess but there are some pretty big annoyances: It has to import comics, which is fine but then it has to do a one-time creation of cache thumbnails or something for each comic you open for the first time and that can take quite awhile. On top of that there's a loading time to just open a comic. When adding comics to collections it doesn't auto sort by name so if you don't put them in your collection in the correct order the first time it's pretty annoying to have to manually re-order them. When grouping comics it doesn't take comics you've already grouped out of the list so you have to wade through your entire collection just to create another group. When you start it on it defaults to showing you the most Recently added comics; which some might prefer, but if I've taken the time to group them I want it to default to Series. The splash screen is ugh. A built in music navigator, why? For images that are wider than they are tall (2 page spreads) it shows you the entire image zoomed way out forcing you to zoom in or rotate to landscape mode. It's a competent reader, but far from the best.