I’m just curious how well they work…and whether or not the "boxed in" edges of the plow keep the snow from rolling off to the side when plowing large open areas??? I was also wondering if they get caked up with snow when the snow is heavy or wet??? I wouldn’t mind having a wider plow but I’m not sure about the "boxed in" edges.?.? Are they worth buying/adding to my plow or should I just stick to the straight/standard plow blade? Thanks!