Mixed
The time savings mostly came from avoiding the initial "type the boilerplate and make it compile" part
bonzini on Hacker News
saved optimistically 20-30 minutes over a morning
In the thread “Has the cost of building software dropped 90%?”, replying to this comment
Helped: Avoiding initial boilerplate and making code compile.
Got in the way: Code made no sense; waiting for fixes was inefficient.
… It saved a few minutes and overall the code it produced was a decent first approximation, but waiting for it to "reason" through the fixes would have made no sense, at least to me. The time savings mostly came from avoiding the initial "type the boilerplate and make it compile" part. When completing the refactoring there were a few other steps like where using AI was useful. …