Yup, we love it. I moved to it a few years ago and it's worked fantastically. We've used it for everything from debugging access to newer services by simply including additional headers (in a staging environment of course) to blocking older versions of clients (we make games, there have been odd ways people cheat) to much more fluid handling of CORS, to direct access to Redis for fast polling for older devices that don't support web socket connections and more. This, of course, was all before the JavaScript interpreter was added to nginx proper, but I feel no need to move over to JavaScript so long as open resty stays supported.

Edit: and it's fast as all get-out, I might add.