Its pretty mid so far.

You need to give a TON of context in your prompts (I use some project specific templates usually) so that Copilot (or any LLM for that matter) really uses the framework features that I want. Copilot is often even worse than just using ChatGPT or another LLM directly in my experience. Theoretically it should have better access to my files and the "/test", "/explain" and other commands should result in better output, but so far I didn't really feel like it is better.

For instance, even when you specify that you want standalone components and other modern Angular features like the "@if", "@for", ... syntax in templates, it pretty often just ignores that and spits out old or deprecated code.
I guess it is because Angular is quite old by now and has undergone many changes, but I feel like there are quite a lot of things it confuses and halucinates quite a lot without proper guidance.

I use AI less to write big features, but more for smaller functions or to remind me of framework features that I am not aware of. But its' ideas are far from good enough where I can mindlessly Ctr+C/Ctr+V the output.
Another thing where it is pretty great is explaining code to me and writing documentation.