I have spent the last couple of days playing with Copilot X Chat, to help me learn Ruby on Rails. I'd have thought that Rails would be something it would be competent with.

My experience has been atrocious. It makes up gems and functions. Rails commands it gives are frequently incorrect. Trying to use it to debug issues results in it responding with the same incorrect answer repeatedly, often removing necessary lines.

Have they started rolling it out? When did you get access?

I've had access since 2023-05-13. You have to use the Insiders build of VS Code, and a nightly version of the Copilot extension.

I take it that you have to subscribe to Copilot in order to get access to Copilot X?

yes you have to subscribe