I used a Montgomery Ward (Yardman) Lawn Tractor for a decade. Then decided I wanted the exercise so my Snapper 21" Commercial model was put back into service and my Lawn Tractor was sold. I use the Snapper and the LawnBoy (2 stroke) alternately during the season, but I use the Snapper solely in the fall because of the HIVAC efficiency to mulch and pick up the leaves.
I've been walking now for 20 years and it may be time to start thinking about getting another tractor for my 1 acre heavily wooded property. The problem is there is so much trim, a walk behind makes more sense.