I have used Interspire Website Publisher, Joomla, Drupal, WordPress and so many more CMSs, but by far Concrete5 is hands down the best.
The inline editor makes it so quick and simple for users to update content.
Teaching users how to update the web sites is now made so easy.
Theming templates for many CMSs is such a task, but with Concrete5 I have had no problems at all.
The community is the most friendly I have ever known and there are many add-ons and templates in the marketplace that can be used for free or purchased at an affordable amount.
If you need a CMS, then look no further than Concrete5 - you have found what you are looking for.