I've been using clj-rethinkdb in production for a few months and its stable. Its also up to date on features afaik and the codebase is fairly clean, so adding new ones as needed shouldn't be hard. The author is also reasonably responsive.

I've also used Revise a lot and it was great, but the author is busy and hasn't been able to keep up with RethinkDB releases so its now a few versions behind.