What was the quoted delivery date at point of order? I know you said they arrived a day early but I've been looking at them most days for a couple of weeks and it's only just dropped below a month.I ordered mine on the 12th Jan and got mine today so they are definitely shipping faster.
Assuming you bought from Apple. If not then it's irrelevant really.
It's ridiculously bad, but they're a great headset for films and music when travelling.