Its options are rather limited, you can choose whether you want to capture the full screen or just one specific area, and if you want your images in JPG, PNG or BMP.
To make your captures (which by default will appear on the desktop), you have two possibilities: either click the big button 'screenshot' or press 'Print Screen'. In either case, you will make an instant screenshot.
The biggest advantage of Screenshoter, with respect to its stiff competition, is its simplicity and ease of use. This should be enough to convince users with very little experience.