With a corner lot and a lot of sidewalks I put this thing through some heavy duty edging.  I have also used the trenching feature to make a deep line for a new landscaping to then insert a spade and dig the trench.  Also used it to dig a trench to lay some wire for the electric fence on my garden.  It worked fine for that.  So I am a heavy user.  Unfortunately it stopped working after 20 months and so being the engineer I took it apart to try to fix (voiding warranty). Found the plugs/leads to the motor brushes were burned off.  Re-soldered them back on.  The contacts are probably burning off because when I jam it into a deep batch of grass (which is a lot of the time) it causes the motor to have to work harder and the amps on the motor to spike.  After fixing the unit it worked another couple of times and now burned out again. Contacted Black and Decker and they still replaced my edger under warranty which was super nice - because I really count on this product a lot in my yard care.