Ello! What’s your experience with `ActionCable`, or more simply do you know anyone running it on prod?

I used ActionCable for a new feature, only to discover that our production environment (Google App Engine) didn't support WebSockets, so we had to throw it all away
 
GAE now supports WebSockets, but we'd already moved to a simpler solution
 
Also, ActionCable doesn't have access to session information, which can be very annoying, depending on your use-cas