They don't work well at all for us.

We have a relatively large Rust codebase and I would describe the LLM's as actively harmful at making agentic-style, self-piloted changes.

Very pointed context management with split screens and explicit inclusion of relevant files in the context is sometimes useful though.

My biggest gripe is that AI can't just generate a new SQL migration and CRUD routes for an additional resource we want to add without issue. I always have to punt and end up doing it myself.