WinShrink does not impress through the interface, as this is designed in a really basic manner. The functionality was preferred over the design and you might find this as an advantage as you will not be distracted by anything throughout the software's menu. A few buttons and drop-down menus are enough to help you in your task.
WinShrink is suited if you want to size down an archive in a fast manner. A few popular archive extensions are the ones that make the object of work for WinShrink, and there is no need for more, as they are probably the most you will encounter.