One year ago, we launched a website powered by Kooboo CMS.
The deployment was easy and everything was OK. The problem is that a lot of modules are not set or not mature enough to be used under the production environment.
For example, there was a big bug in the forum module. As we couldn't wait future releases that would come with the fixes, we considered editing the code.
On the other hand, the admin interface is really awesome: Full AJAX and easy to understand.
But, unhopefully, I would not recommand this CMS as it is still IMO in a development process.