On lawn grass the cut will look rough and uneven, plus it's hard to mow low enough without the skids dragging and making ruts and torn spots in a lawn. I have my blades on the brush hog as sharp as lawn mower blades, and the grass cutting is still rough and about 4 inches high at the lowest setting. A brush hog with sharp blades is great for cutting grass that is cut only a few times, or even once a growing season. It will go through 12 inch tall grass that would almost instantly choke most finish mowers.