I have a new system. the new blades I just installed will be swapped in the fall for the old blades I just pulled. an acre of leaves from the giant trees surrounding the house is pretty harsh on the cutting edge and my attempts to get an edge back usually result in an unbalanced blade. heck, one year the "cutting edge" was almost as dull as the back side of the blade! oh, and our "lawn" consists of whatever grows that's green. some of it is grass. I'm so glad to be free of suburbia!
what do you guys do about them each year?