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I'm still mostly using the Omnicore X-develop IDE, even though Netbeans has a lot more additional functionalities and plugins. The main reason is their support for instant project-wide on-the-fly error checking. It is not an easy feature to explain since many people already think their IDE supports this. I tried to explain it in this article: http://www.artima.com/weblogs/viewpost.jsp?thread=172805 The main aspects are that it works on unsaved files, that it is insanely fact (class name changes in a project with 4113 classes and 301 thousand code lines take a little more than a second to introduce errors all over the workspace), and that it marks all the files in all projects and dependencies with an error count and erroneous file count in the status bar. It allows developers to use a free-form refactoring coding style and makes Java coding very agile an pleasant again.
Overtake.