I usually break one mower per year in my yard with all of the hazards... I live across from a forest preserve and have lots-o-trees in my yard and flagstone rocks lining my creek in my yard....
I've killed mowers in two weeks sometimes by hitting a cut off tree stump or old fence post that I didn't see when the grass was too long.... :BangHead:
Fortunately, last summer I didn't break my mower.... :thumbsup: