This extension has been available for a long time, however it was not very comfortable to work with it because of its incompleteness. In TYPO3 3.8.0 most of the missing features have been completed.
Here is a brief summary:
Support for flexforms (hence TemplaVoila)
Support for RTE embedded images
Support for updates of existing records in various forms
Optional XML format
Support for a new concept called "soft references" which are plain-text links/file references/markers and allows to track and include these in export. Examples are "fileadmin/..." references in TypoScript templates and <link> typolink tags.
It can export from the page tree root
Extension dependencies can be set
Export links directly from clipboard and Web>List
Support of meta data including embedded thumbnails
Added a new feature to force all UIDs in the Import/Export function
In the shortcut frame its now possible to enter a table:uid pair in the "Edit page" box. For instance "tt_content:123" will launch the doc module for that element. This is a nice feature to jump directly to a content element.
A new feature offers collapsible modules for the backend module bar so you can hide/unhide the modules to fit your needs.
The context menu now also works by clicking with the right mouse button on an icon or a text. Additionally it also works with Opera browsers (minimal version: 6.x) now.