I've used ACP extensively because agent-shell in emacs uses it, although the Anthropic license change means I'm not sure if I can continue to use Claude through it without getting banned. I kind of wish it integrated more tightly but also you can't really expect someone to have magit involved such that agent-shell (or the like) starts interacting with emacs directly. I'd love it if it did though.

I've started using OpenCode for some things in a big window because its side-by-side diff is great.