In May I bought a new D170. It replaces my 11 year old 42" Sears Craftsman. When ever mowing bahiagrass it always left a strip down the middle. New blades going slow it didn't matter. Only way was to cut very short. I was afraid the new JD D170 would leave two strips. With the 54" it cuts even tall bahia cleanly. Those of you who don't have bahiagrass it can be tough grass to cut. I don't know if there is a slight overlap between blades all I know is it works. What a relief. Anybody else have bahiagrass stories?