The way I look at it is this: 330d RWD is brilliant value. A 335d xDrive will cost significantly more but provide great performance. So if you are going for an F30 6 cyl Diesel, it's 330d RWD or 335d xDrive. No point going for a 330d xDrive IMVHO as it's neither fish nor foul. The 330d RWD is THE golden nugget