Well I finally got a cover-up for my dingo. I have to say I am not extremely impressed. My dingo tx425 undercarriage smooths the trench line. I tried using it backwards and reversing flow, but that doesn't work. I guess I don't really have enough ground clearance. Do you guys use it on existing lawns? It seems like you have to take caution not get to deep into the grass. It should save some time on new construction.