It's pretty much free, if you don't mind the nag dialogs. And it's well worth the money - finally, who cares if it's open source? You can build anything you need on top of it. Maybe it doesn't satisfy some lofty "open-source" philosophy, but for practical purposes, who cares?
Learning an editor is an investment in a developers time. Software has to be updated and maintained to work on newer operating systems. With popular open source editors, you're pretty much guaranteed that the software will continue to evolve. Can't say the same about proprietary editors. I think a lot of developers could use an open source editor for their entire career, something highly unlikely to happen if they were using a proprietary one.
