My experience with code completion tools (i.e. single line/method snippets) has been positive. But, anything more complicated seems to fall apart rather quickly.

Mine is a senior developer with memory lapses.

And that sometimes you need to bully a bit to get coerced answers out of... feels bad

I have upgraded to the $200 Pro tier, and, with o1-pro, all of my tasks delegated to the "junior" have been so much better. It takes longer to complete, of course, but the overall duration is less because I'm not having to go back and correct it as much as I was with 4o. It's been able to figure out problems that 4o continually failed on.