I've used them off and on for basic stuff like "tell me what this query does". They're usually pretty good at that. Sometimes it will make suggestions that ar

I've used them off and on for basic stuff like "tell me what this query does". They're usually pretty good at that. Sometimes it will make suggestions that are meaningful improvements, most of the time not. Unless you specifically ask about something like "would this be better done with a left join lateral/correlated subquery?" But you kinda have to already know what you're going for and then it can be helpful.