Pantheon Files is the default file manager for elementary OS.
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Pro Easy to use
Pantheon files (like the Pantheon IDE) is very stylish and minimal. It's minimal and very easy to use. The most useful commands are there in plain sight, on the toolbar or the sidebar.
Con Not very advanced
Pantheon files (like Elementary OS itself) does not offer many advanced features since it's mostly aimed at beginners.
Was missing basic network connect features when Loki launched.