It's great! You'll have to learn how to make projects tho. They completely changed it. There's now multiple modules within projects. You'd probably want to create a new project, and then a single-J2EE module.
My favorite features:
HotSwap. I can't live without this now. While debugging: change code, compile, hotswap. Refresh page/run again, etc. Such a huge timesavers.
Pop Frame. This is another debugging feature. You can sort of go back-in-time while debugging. Hit the pop-frame button, and you can reexecute code.
I haven't used the GUI Designer, so I have no comments on that.
Go to Symbol is sweet. CTRL-ALT-SHIFT-N. Like CTRL-N, but works for fields, methods, classes, etc
The built-in visual diffing is pretty nice.
Oh, CVS and VSS integration is VASTLY improved. You can see what lines have been modified as you change stuff. And rollback certain sections. CTRL-K to check-in all changed files. SSH support is very simple now too.
You can split the editor. (note: different than splitting a file)
Plugin integration is all built-in now. Some sweet plugins: Inspection Gadgets, Intention PowerPack, SQL Query, Rearranger, Hibernate, Struts, etc
It's definitely worth it.
sweet. I hear it has better support for web application servers which is good, because we use Resin here (and Weblogic for EJB stuff). Can't wait to get that working hopefully for debugging purposes.