I have used many CCK components specially for Joomla,(K2,Sobi2,SobiPro,Seblod). Even-though all of them have some unique features and advantages , But FLEXIcontent IMHO is far beyond when it comes to everything: Flexibility, Ease of use, Learning Curve, Features, Expandibility , ...
The only weakness that's not related to the Project itself is 3rd party support.
And I wish more 3rd Party Companies support it Out of the box (as for K2)
