The only extension on JED that helps to easily manage, backup and update multiple Joomla! sites in few clicks.
Ease of use
The extension is easy to use, however I'd recommend reading the documentation in order to properly configure the websites.
Documentation is available on developer's website. Was helpful enough to understand how to configure the extension.
Value for money
It's the only product of this kind. Definitely it's worth every penny of its price.