I got rid of the walk behind in 2005. The belt drive did not pull the seats well, they made the mower lose some turning radius, and reverse was out of the question. I pretty much stopped using the sit down sulky and walked every yard for the reasons I just stated.
Bailey Lawn Service of Tulsa
52" scag wildcat
36" scag v-ride
Shindaiwa t-270, eb-630
Scag giant vac w/ 18 hp vanguard