AD Picture Viewer allows you to view your pictures like in a slideshow. The slideshow can be paused and resumed whenever you want and it can be viewed in full-screen or windowed mode. You can also select the delay between images and modify the image sequence. You can even add a description to all of the pictures and apply filters like blur, sharpen, color, stylize and others. You can sort the images of the album in ascending or descending order alphabetically or edit their order manually. You can copy any image, its filename or the full path to the clipboard, create a series, set an image as wallpaper, and even print or send it to friends directly from the program. From the configuration menu, you will also be able to modify other settings of the program regarding the viewer, shell integration and browser.
In short, AD Picture Viewer is a nice viewer which doesn't include anything special that you won't find in other similar programs, so you should try it before you decide whether it is worth buying or not.