I am using Include Excerpt to host an image used on many pages of my site so if it needs to be updated we can update it once and it will update across the whole site.
This functionality is working well, but there is a bug. After the Include Excerpt macro is added (I turn off surrounding panel) the macro disappears in the editor, but when you save the page it works properly and displays as it should. This can make editing the rest of the page difficult as there is an invisible chunk in the middle of the page that can't be seen.
Edit: Confluence won't let me report a bug so I'm publishing this in the community.