Since I have tennis elbow, I can't lift the weed eater to do the trimming around the sidewalk and driveway anymore, so I bought this electric edger.  We use to own a Black & Decker edger years ago when we lived in another town.  The positive for me about this one is that it does not cause my tennis elbow to hurt.  The negative is it doesn't seem to be as solid as our old Black & Decker.  The screw that keeps the blade in place worked loose on me one day, but I just tightened it, and it was fine.