After reading about a guy who had a stick/wood piece enter his back and come out the front of his chest while brush hogging, I decided to make a shield too...mine is made from a heavy duty stainless steel perferated baking sheet.
I understand the guy that was injured afterwards made a shield for his tractor out of 1/2 inch clear lexan.
Chain guards are expensive but seem pretty functional. I just wanted a little more protection, just in case... /forums/images/graemlins/blush.gif