 Sold my '03 BMW X5 and purchased my ML 320CDI in Jan '08.  I was torn between the Mercedes and the new BMW X5 but chose the ML based on good looks, power and fun to drive.  I find I just want to get in the car and drive.  The SUV is smooth, quiet, luxurious and most of all great fun to drive.  Terrific sound system. Average 22 mpg combined city/highway.  No problems since I purchased it.  Would highly recommend.