It was pretty snazzy. Free and free. It Just Worked.

Deploying new war's was as simple as copying a file into the deploy directory. Want to undeploy the war? rm the file. Within 5 seconds (usually less), the JBoss server noticed the change and deployed/undeployed successfully.

Easier to install on *nix than on Windows, it seemed...But then, we were basically a Linux shop anyway.