I wrote a small (relatively) 
JavaFX application using the public Twitter API. As mentioned earlier 
JavaFX runs fine 
under Linux although it is not yet officially supported.
I have been using Eclipse for many years. Which means I'm a total Netbeans newbie, but Netbeans generally behaved and I found my way around pretty well. Though the support for 
JavaFX in Netbeans is not as good as other language support in NetBeans.
The thing I am missing the most in 
JavaFX are some kind of good component libraries. Chances are good, that the next version is going to solve that one. 
JavaOne may brings some new things...