I'm bidding a property that consists of 35 town-homes, all with shared driveways and sidewalks in between. The contract requires weekly mowing and edging around the sidewalks and driveways. From my experience, it's just as easy and quick to turn my trimmer sideways and edge with it. However, I have never had to edge this large of an area. I have never used an edger machine so I have no idea how fast and efficient they are. Can anyone tell me if an edging machine would be a worthwhile purchase or am I better off to let my trimmer do the work?