It's great to have such powerful tool for Java development, which offers excellent performance of applications as well has many advanced features like HTTP client/server support with SSL encryption etc - all built in one package! The only downside I see at this moment (as always) it could be more user friendly especially when we are working over Eclipse IDE instead pure command line or terminal window would better suit our needs :).
Very solid product overall but not enough easy access from non technical users who want just get things done quickly without too much hassle about setting up servers / configuring web services protocols that requires years experience sometimes even :) Also if you're newbie developer then there may need some time before fully understand how everything works so don't rush into production environment right away since your first step will require quite lot amount training effort ;D As mentioned above though very good technology once.