Since I almost never post to HN this must be the story to do so:

I have used rethinkDB in production since may (and obviously in dev - about since v 1.1). It's kick ass. The things you immediately fall in love with is the awesome admin dashboard, data explorer, and of course the very beautiful query language.

Full disclosure: I am not employed by RethinkDB, I am just a fanboy and user :)

Thanks again Rethink!