I had a previous Edge-Hog for a little more than 8 years when the motor brushes finally wore out.  I could have bought the replacement parts and changed them out for $30, but then I decided to just get a new one.  There are a couple of changes between the older and the newer model.  The new unit is lighter and seems to have more power, though that may be because of the new brushes working better.  The one BIG change is the guard over the blade.  It is too soon to tell if this is an improvement or just a way to save money on their part.  It certainly is less safe.