I have a 7 mile journey to work in my DPF equipt Fiesta, 6 of which are dual-carriageway. It has an EGR blank, Bluefin remap, never sees a drop of supermarket diesel, and I'm yet to experience any issues in nearly 3 years. Knowing the potential of DPF failure, I make sure the car has a long run once a month and is serviced to death. Cats, DMF's, DPF's all have their faults, the biggest of which is people who do not understand them. A little understanding will make any part last the life of the car.