I've used it and its very good at writing simple programs - in particular, programs that do 1 thing. Or programs that do many things with zero interactions.

But once you get to even a mildly complex program - defined as a program with a handful of intertwining but otherwise independent parts, things seem to go wrong very quickly.

So, yeah, its good at solving leetcode hard. But it seemed very difficult to use when I tried building even a simple RPG combat system.