@subtlecourage hmmm, good question
Depends on how consider production ready.
Yes, it's working ! To send out SMS and receive inbound.
But no, because the app is still officially beta, and there are features not yet implemented (voice but I don't need that) and contacts management, export of SMS
Overall I think it's worth trying out, with the understanding that it is still evolving.
EDIT : if you follow the LXC installation route, it's easy to try it out. Just remove the container if you feel it's not ready yet. Telnyx numbers are month-by-month subscription so no long-term commitment.