Benefits
A pre-assembled development environment
Includes both tooling and runtime components. No need to cobble one together.
Tested and certified
All components, like JBoss Seam and Eclipse seam tooling work well together as well as across other components, like Hibernate, JBoss AS, etc.
Assurance of compatibility
All JBoss Developer Studio plugins are compatible with each other and runtime components and their dependencies are compatible with each other.
Certified updates
You don't have to worry about updating parts that may not work with the rest of the environment.
Includes JBoss Enterprise Application Platform
Contains the versions of JBoss AS, Hibernate, JBoss Seam, and other components that Red Hat supports in production for five years.
Includes Red Hat Enterprise Linux and access to Red Hat Network.
JBoss Developer Studio includes access to Red Hat Enterprise Linux, Linux development tools, and Red Hat Network for development purposes. This enables developers both to build applications directly for the industry-leading Red Hat Enterprise Linux as well as to take advantage of features like Red Hat Enterprise Linux 5's built in virtualization for development environments.