What issues did you have? I am using it and I am quite happy. I do not have any auto complete, but I am using the in-editor shortcut on a regular basis. And the currently free claude integration (you have to sign up), works just fine.
My primary issue was, that I could not find any good tutorial on how it works. From what I found in the documentation, the in-editor feature uses the current context from the sidebar. There are shortcuts / commands to send the current file / code snippets to your context. But you can write it up your self.
The best introduction seems to be their blog post about it: Introducing Zed AI — Zed's Blog
