I am a member of ketogenicforums.com which uses Discourse, as well as a member of the official Discourse support forum. I thought about using it when I was contemplating starting up a 2nd community. But It's a bit plain and too minimal for me. It's another modern community software competing against the likes of Kajabi and Mighty Networks by copying a bit of what they do and tyring to blend it with the forum concept of old (kinda the direction where Invision is heading).
CarnivoreTalk.com - An Animal-Based Diet Community, with a Podcast and YouTube channel coming soon.