I guess I got just a little to confident! While mowing a new lawn today I flipped my Walker of a rock ledge about four feet tall. Anyone who has owned a Walker knows that they don't have great traction going up hills. When I came around the end of the rock ledge and started up the hill I lost traction and started sliding back, luckily I jumped clear just before she went over. No damage done to me or the mower. I think in the future I will use my Z-Master on this account.