After having built a chess appliction with a real time component, this demo was right up my alley. The abstraction of channels and subscriptions (combined with JavaScript callbacks) will still take some getting used to, but I found the author did a good job of explaining everything in an understandable way.

After reading Websockets, caution required! from Sam Saffron, Websockets seem to have a lot of limitations, some of which are addressed by HTTP/2. It will be interesting to see how the real time landscape changes in the next few years.