Been playing around with it in Cursor and have to say I'm pretty dang impressed.

Did notice a few times that it got stuck in a loop of trying to repeatedly make its implementation better. I suppose that is ok for some use cases but it started overthinking. I then gently prompted it by saying "you're way overthinking this. Just do a simple change like ..."

I guess there's still a purpose for developers

You are now fine tuning their models, and you pay them money to do it.