I've been working in the NetBeans IDE v 6.1 for a few weeks now.
The draw is the Swing UI development tool, Matisse.
I usually work in Eclipse, with the MyEclipse extensions. Unfortunately MyEclipse hasn't seen fit to port Matisse to OS X.
Sun / NetBeans has.
But it's really vastly slower than Eclipse. I often find myself spinning back in my Aeron from the keyboard as I wait to see just what the hell NetBeans is making of my typing. The response lag is astounding.
It choosing to delete entire blocks of code isn't uncommon.
Once I have this UI nailed down enough to spin back to Eclipse I'm outta here.