I switched to NetBeans after version 7.0 has been released. It's faster, more lightweight and code completion is better. Its easier to configure and looks like everithing just works, in Eclipse you need to deal with complex configuration, and I wanted to focus on coding. But they are both good.
I compared them, you can read more on http://dev.umpirsky.com/eclipse-vs-netbeans-for-php-development/
