The program is capable of opening any current comics format, so you don't need to worry about compatibility issues. And, it's so fast that your comics will be loaded in the blink of an eye.
Paper Comic Viewer has all of the features that you would want in a reader: you can navigate between a comic's pages as you like, read in fullscreen, rotate pages to read them in a different orientation, and make use of a magnifying glass feature to zoom in on a portion of a page.
The program also remembers the last page you read, so you can close the program and open it again without losing your place.
This is an extremely useful tool for any comics fan.