I am going into the fert. & squirt a little heavier this year. I am actually offering as a stand alone program, previous to now was just offering service to my mowing customers. I know most people prefer granular for fert. and spray for weeds. Not ready to invest in a spray tank. Saw a unit at Gregson-Clark that dropped into my lesco spreader and made a mobile spray unit. Anyone have any history with this unit? Good idea or not, PLEASE give feedback.