I'm surprised there isn't an option of zero stars because that's required for DX Express.
I received notification of a delivery by Next via DX Express, however the driver didn't turn up to my property and we received was a failed delivery notification. I know the driver didn't turn up because we can hear a fairy fart outside the house and the dog gets involved whenever a van pulls up anywhere on the street.
Awful service on the chat roulette and I wouldn't advise using the phone lines because I received no response.
My advice is check with the company you're purchasing from and if they use DX Express try somewhere else.. I will avoid them in future.