I haven't but I'm planning a new site and I'm going to give it a go. I have a site with entities rather than just pages, so the content model seems to fit. I used Django-CMS about 4 years ago and it didn't support the people editing the site in terms of UX. So I ditched it and went with Wordpress (which I'm not happy with, hence wanting to change).

I used to work for Torchbox who are developing Wagtail, so I heard about it before it went public. But looking at the uptake on http://madewithwagtail.org/ it seems to be doing very well in the market.

Wagtail isn't so new now - it's coming up to two years since we launched the open source project and there are now thousands of sites in productions, with high profile users including NASA, Google, NBC, the US and UK governments. Wagtail takes quite a different approach to Django CMS and we're very happy to see their continued progress. Congratulations on the release!