Unfortunately I have not tested Eclipse with JBoss nor with some special JBoss plugins.
From my past BEA WLS integration experience the plugin might be very good or just very poor.
What I am using is MyEclipse which offers very good connectors to any app server like Tomcat, BEA, JBoss where it makes fun to develop because of hot-sync / hot-deploy of your Java code into the app server.
It also supports starting the app server with configuration in the Eclipse IDE.
The professional version of MyEclipse only costs some $ / year subscription and offers a 30 days trial.
So I think you would like to compare the special JBoss plugin for Eclipse with the MyEclipse app server connectors.
Technical J2EE Solution Consultant<br /> - Specialist for Middleware and Messaging solutions --<br />Certified SCJP 5.0, SCBCD 1.3, SCEA I (SCJD, SCEA II/III running)