The chat interface is... fine. Certainly better integrated into the editor than GitHub Copilot's, but I've never really seen the need to use it as chat—I ask for a change and then it makes the change. Then I fixed what it did wrong and ask for another change. The chat history aspect is meaningless and usually counterproductive, because it's faster for me to fix its mistakes than keep everything in the chat window while prodding it the last 20% of the way.