My last car was an ST220 and it was fantastic in every way...........except fuel economy which was to say the least poor (but then my right boot is a tad heavy).
We part exchanged it two months ago for one of the last ST TDCi Mondeos and I have to say it is fantastic. It has all the creature comforts of the ST220 but with the fuel economy that the diesel brings. We had it chipped with a bluefin unit and to be honest (although a bit slower than the ST220) it is rapid. Top end is not as high, but how often do we get there!!! You do have to work the gearbox far more, especially if its goes off boost (when it does bog down a lot) but with the turbo spinning it is a joy to drive and I would reccomned it to anyone.