I use them both extensively. At first it was awkward because I was used to the somewhat sloppier IMHO VisualCafe, but I've come to love Forte/NetBeans and the way it handles projects, etc.
Just make sure you have plenty of RAM! It has the annoying "feature" on Mac OS X, that you can't click-through from one window to another, so if you're in the editor pane and want to click on a toolbar button, you have to, essentially, double-click the toolbar button. Oh well.
I just installed NetBeans at home, and on my computer in the lab at school. The JavaDocs worked fine at school, but not at home. I tried tweeking with things, even copying the API's my instructor put on a CD for us, and it still does not work. I even tried the html path.