What ive read, and what is accurate according to my experience, is that its very fast for creating smaller pieces of code, like scripts, foundations, docs etc. So with a small context, its great.

As soon as you start to ask it to add features to a larger code base, it will mess things up and add code that is not necessary, and add extra complexity. And it will now be slower to use Ai than before, because now you are spending time iterating and correcting, and you may not even get a working solution at all.

Thats my experience with Ai.