Boss GR-D: Distortion With A Difference

Boss GR-D

According to the Boss UK Blog: “The clarity of the distortion needs to be heard to be believed”.

But what is it that us guitarists are looking for when we buy a distortion pedal? Are we looking for clarity or are we looking for filthy (opposite of clarity) distortion?
Now I can see some benefit of being able to apply different filters at the string level, such as less treble for the higher strings when soloing. But the description of its distortion just sounds odd to me…. I assume it sounds the part in real life though.