I've had to endure this company on a number of occasions and they are consistently awful.
The customer-facing staff work in a call centre which is not connected to the delivery network - there appears to be no way for them to directly contact drivers. This leads to a deeply frustrating, Ryanair-style of customer service, meaning there is no channel through which affected customers can address, let alone resolve any problems.
My experiences have involved drivers not attempting to deliver packages (to a delivery bay which is filmed and manned 24 hours a day) and then claiming that they had. It's frustrating enough to repeatedly not receive a delivery without being lied to over and over again.
My office is in central London and my last package eventually arrived over a week after the initial delivery date. This followed a mind-bendingly annoying spate of made-up excuses, poor internal communication within DX itself, and false accusations directed at me personally.
The company is truly shambolic, and appears to only still exist as a result of securing public service contracts (from the DVLA for example). Presumably they can offer very cheap contracts as a result of not actually being a delivery company:
Delivery companies deliver things on a certain date in return for payment. The DX does not.
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