I own a little WH B80 that has been in the family since new. My father bought it in '77, and then gave it to my grandfather in the mid '80s. When my wife and I bought our house, my grandfather gave me the little guy. I replaced the head gasket, battery, spark plug, and cleaned the carb, and she hit on the first turn of the key.
I have the belly mower, plow, cultivator, and disk for this little rig. After more than 30 years of mowing duty on two several acre yards, this little K181 Kohler is still going strong. I have heavy lugged tractor style tires, and the B80 pulls my single bottom plow with ease.
In heavy, wet grass, I have to mow in lower gears, but I would mow against any lawn tractor at the box stores. They don't build them like this anymore, and if they did, nobody could afford one.