They let the track go deeper in the snow before you get stuck. That's it.
Does nothing to stop the front from plowing and in fact can make it worse with the change in angle they create. Unless one does something with the track for deep snow performance there is no point and the brackets don't do anything for track to tunnel clearance that would allow a deep snow track.
They scare me when I see them on the trails as I know they don't corner worth squat and that can be ugly when meeting head to head in a corner.
As with most of these gadget/gimmick type add-ons you see for stuff they only tell/show the part of the story they want you to see/hear.
opsled
PS, I don't think they look cool at all.