How much of a difference in shave is there between the Gillette Sensor and the Gillette Contour (or Atra)? Do the sprung blades of the Sensor make a significant difference? And does the guard with the microfins on the Excel actually do anything? I guess this question is in the same league as the “are three blades better than two” debate. I shaved with a Sensor Excel last night and it was equally as good as the Mach 3 but the face feel is very different. So is the Contour equally as good as the Sensor?