Sensor is a good razor. For that matter so is an Atra II. I have both and still keep cartridges for doing trim work on the back of my neck below the hair line. A twin blade pivoting razor can't be beat for that.
I remember in the old days liking the Sensor much better than the M3. Has something to do with the angle of the razor head to the handle. The M3 is poorly designed IMO, I could never shave my neck w/ it.
