I am amazed how well it works. Yesterday I have spent a full day with a new macOS project with idea in my head. Spend half a day writing basic features, and after that opened the project in Zed to add features. Not very well documented things like AppKit + SwiftUI integration - no issues, and I mean I was getting about 500 new lines from my questions and was getting compilable code (and working). A few times after review I modified a few things to make it compilable/or better. But still.
And I had one interesting problem with objc/swift and javascript integration - and Zed AI delivered some masterpiece in JavaScript, that is definitely outside my knowledge.
This technology is definitely going to change how we program now.