I've installed jboss, eclipse and upgraded to get the jboss ide plugins.
After that, I've decided to follow the tutorial showing how to build a j2ee application (very simple, a session bean/servlet and a simple html page).
So what's my feeling after having done 26 pages on 40 ? At a first glance, I had the feeling that it was very complicated but It's always like that for the new things.
The technique used with jboss ide is that you create your bean or servlet adding annotations in remarks (@blablabla), you have to build xdoclet configuration file through a user interface and run it with ant allowing to build ejb home/remote interfaces and all the stuff. Really technical and you don't always understand what are the options and values to set. It's already a lot of work for a tiny app, so don't try to imagine for big application.