I actually tried GitHub Pages for awwx.ws before I changed to hosting it myself. I don't know if this is still true, but at the time they rendered pages as a batch process: I'd make a change, and some indeterminate time later -- sometimes immediately, sometimes after a long delay -- the change would appear on my web site. I found this killed my productivity.
At this point I'm willing to put in the time to implement a solution that works the way I want it to.
However I wouldn't discourage anyone from setting up a GitHub Pages for Arc today. I hope that my site will turn out to better than GitHub Pages (for this particular purpose), but that doesn't mean that you need to wait around for me to implement something, or even necessarily that you will in fact find my site better than GitHub Pages.
Anything that gets published on GitHub Pages I can import into my site when I actually have something written, so any work you do now in GitHub Pages won't be lost if it turns out that my site does work better. And GitHub Pages are really easy to use and get started with, so there isn't a big time investment needed there either.