All of the 'professionals' we are involved with seem to think so.
I understand it isn't properly acquired language, but surely it is useful?
As examples, last night DS was saying 'it's time to go to sleep now darling' to DD. This morning he keeps saying 'it's a special day' (it's his third birthday). He repeats things we've said, but in context. It is just that it is word for word.
the things he repeats are a far cry from his day to day speech (pretty much zero), but I can't help but think it's a good thing. It's just so nice to hear him talk.
Sorry if I'm not making much sense.