This image shows the SpaceMan 99 main window. As you can see the top half is very similar to Windows explorer, except that each folder also shows the total amount of disk space used by all files under it. Also, each file shown in the list in the top right panel has a symbol next to it that shows if any other copies of the file have been found.
The bottom half shows duplicate files. The list in the bottom left panel shows each set of identical files found, one set per line. The list in the bottom right panel shows the identical files in the currently selected set.