Just took it for a spin today because of this article. It's excellent! I love how it handles setting the "pre" and language code in the editor. One thing that all syntax highlighters fail on though (and this one does as well, unfortunately) is there's no easy way to put an actual shortcode in the code as an example. I always end up doing [your-gravity-form-shortcode] just so the thing doesn't get rendered inside the pre tag.

Still, definitely the most user friendly and lightweight solution I've seen so far. Thanks for sharing!