Absolute joke of a company.
I have used them both as a shipper and a receiver. At work my company use DX for heavy/bulky items and they fail to show most of the time then complain when they have a load to carry.
As a receiver they are also awful! The tracking is very rudimentary (DPD and Amazon logistics rule here, closely followed by royal mail and their 'by 1pm' service) as it says your package is out the depot and that's it, no estimate for delivery or anything, similarly even though your parcel says it is out for delivery there's no guarantee you'll actually receive it as the driver may decide to keep it in the van and finsiht eh route the next day.