Same - I use it at work at a big tech company and the real world efficiency gains on net are probably nonexistent. We have multiple large and not so large codebases. In a super trivial script or creating a struct from documentation it does the thing - great. For unit tests it’s about 50-50 if it’s useful or if I waste a few hours and delete the change set. In any moderately complex codebase Claude Sonnet or GPT in agent mode builds unneeded complexity, gets lost in a spiraling amount of nonsense steps, builds things that already exist in the codebase constantly. The best outcome I have to edit and review so heavily it’s like I’m jumping in on someone else’s PR halfway and have to grok what the heck did they misunderstand.

The only actually net positive is the Claude.md that some people maintain - it’s actually a good context dump for new engineers!