I'm sure pro-turf has it figgured out with what he feels is best for his customers yards and his buisiness model. Walk- behinds do a better job I feel and he knows it. Im sure he treats his guys good, just look at his website hes got. Zero turns aren't for everyone either. He's just stating his pro's and cons.
Byron Smail Landscape Contracting
Design/Build/Maint. Snow Removal, firewood