It's easy to use, it is very fast when loading documents from other sources like Dropbox or Google Drive (you can even select files directly using drag-and-drop), the user interface looks great with modern design standards in mind, you're able to customize almost everything! The only thing that could be improved would probably be more control over your settings/options; I'd say there should also be an option where users are allowed to choose their own folder location instead of having them pick