When I started first with N/X, I was a little bit confused. Not much things are the same like in other CMS. It took me two days to come behind the system and another two to start working with it efficiently. The documentation is not too big at this moment, more examples would be better.
By now I have already developed four sites using this wonderful CMS. There is absolutely no data-redundancy, the way of structuring contents is more than excellent. I also have written my own Plugins and extended the system with a message-board. Multilanguage sites and Versioning are solved very clean.
The releases are from time to time not prefect and have some (tiny) bugs. Nevertheless the authors always helped me within minutes. I would prefer this system to typo3 and phpCMS, because it does not use any proprietary standards or defines its own language.