Hi Garry,
I have a 2.7 diesel on an 07 plate, and I have never had a problem with the DPF in the last 3 and a half years of ownership. I don't do a big mileage - under 7000 miles a year, but it doe get a longish run 40 miles or so once a month.
I also use an additive to clean the DPF and the EGR valves.
However, Joe is quite right if you are only using your car for a daily drive to work, but as I don't work any more and enjoy the days out in he car, and in the winter I do give it a spell on the battery charger every couple of weeks.
The plus of the 2.7 diesel is that it has great acceleration and does return a good mpg, with 49.2 mpg on the drive down to Dorset a few weeks ago.
The 2.7 also has an auxiliary heater to heat the cabin, and when we go out to Lichfield - 12 miles away, it will normally reach operating temperature after 7 or 8 miles.
Regards,
Peter.