Allows you to export and import widgets settings.
I'm not aware of any other plugins for exporting/importing widgets which makes this plugin valuable. However, many hosts still run PHP 5.2 and so unsuspecting users (I recommend this plugin to my theme users) get a fatal error when trying to use this plugin since as of 1.1 it requires PHP 5.3. It's not ideal to recommend users downgrade to an older version of a plugin in order to use it.
In short, it is useful, but not for everyone. Thanks to the author for the work they have put into this plugin.
i like this plugin. but, i cant export json file from my admin side while using wp page widget.