Stuart Herbert, in looking around for an IDE to work with, has given NetBeans a shot and has posted some of his thoughts on the software and how well it fits with this his development.
When it comes to IDEs for working on PHP projects, I've been a relatively happy user of phpEclipse for several years. (Tried Zend Studio, but never managed to convince Zeev about how much it sucks). But when the guys in the office started switching over to Netbeans, I thought it would be interesting to take a look for myself.
He lists some of the positives including its good performance, code completion, code refactoring and some of the weaker points like the fact that it's a memory hog, it doesn't fit in with the OS X interface style, there's too many dialog boxes, etc. Overall, he likes it and found it pretty solid but may not make the switch just yet.