One of the main benefits of Umbraco is it's ability to integrate with Microsoft's other packages. You can update blog posts and content via your local copy of Microsoft Word, meaning a simplistic, familiar format.
Umbraco is great if you work in a larger organisation due to having the ability to allocate user permissions to groups/departments of people, allowing each section of your site to be controlled by the right people. These features, coupled with the versioning control, means that if your laptop should die or you loose connection you will not have lost your updates. Also should you update the site together and an error occurs we can always roll back to a previous version
Here are some well known sites made on Umbraco: