I find that can write features 5-10x faster with these tools than by hand, at a comparable level of quality (though it hasn't been long enough for me to judge what'll happen in a year).
Then I can look at the output and say things like "what if the data is lowercase?" or anything else I suspect they may have missed. A few rounds of these and I have a pretty good feel for the quality of the resulting checks, while taking a few minutes of my attention/tens of minutes of wallclock time to do.
I have a more detailed example here: https://www.stavros.io/posts/how-i-write-software-with-llms/
I'd share all my plans but I once found that the LLM used my actual phone number as test data, so I don't share those any more, just in case.