I tried it too and tasked it to do a bigger migration (one web framework to another). It failed pretty bad where I stopped the experiment. It still gave me a headstart where I can take parts and continue the migration manually. But the worst thing was that it did things I didn't asked for like changing the HTML structure and CSS of pages and changing hand picked HEX color codes...

More about my experience on my blog: https://hartenfeller.dev/blog/testing-claude-code