Jon Gjengset (of MIT Missing Semester, Rust for Rustsceans, etc) shared a stream doing complex changes of increasing complexity to a geospatial math library in Rust. He’s an excellent engineer, and was able to pick apart AI-suggested changes liberally. The caveat is that the video is a bit long, but segmented nicely.
I think he had a positive experience overall, but it was clear throughout the stream that he was not yielding control to a pure-agent workflow soon.