I don't know about Copilot, but I use Cursor with (usually) Claude, and it's very helpful if youbrely on it for autocomplete or writing a SIMPLE function or something. If you ask it to code instead of you completely, it makes bigger and bigger mess until it starts getting confused in its own mess.

Also, it's design capabilities are fairly primitive. It can outcode someone who just came out of college, but not an experienced person.