I've been vibing a side thing in the background for a week. I break it into small tasks, think through the architecture and major important pieces. Then roocode and Claude do next task in several minutes. Sometimes it goes crazy and I had to rollback. Sometimes it's stuck and I have to figure things out. But if you treat it like a super productive junior, it's fascinating. It would take me at least 3 weeks full-time to get where we are now. Just don't think it can do big things alone.