I recent install LifeRay, Jetspeed2 (based on Pluto) and Jahia (based on Jetspeed with extras).
I've spent more time recently on Jetspeed2. This product is very raw in regards to the j2-admin portlet app. I believe this app is the most important one. I would have like to see a more complete Adminstration Portlet Application. Base features like... assign users to groups, or folders or portlets is not in install demo. The api i believe explains how to code this functionality but it would have been nice if these features were already coded to a degree?
Other than that, J2 looks good. IT needs lots of customization.
The others (Liferay & Jahia (Switzerland company)) are very polished products upon installation and running thru the portlets pages. I don't have enough experience with either. Note: Jahia might not really be open-source? It could cost on average $20K because it includes a CMS and workflow portlet application with it?
Let me know your experiences with theses products....