This happened about 2 weeks ago and I was reluctant to post it here, but if it can save someone from getting hurt or worse then it'll be worth it.
My father in law has been cutting wood for about 40 years with an old Pioneer P-40. He is always careful and had never had any injures until now. He was out back cutting wood and the tip got caught and threw the saw back at his face. Broke his nose, broke a sinus cavity, knocked out a couple teeth, tore a tear duct, and he ended up with about 100 stitches. He got cut from just under hie eye down across his lips to his chin. If not for his eyeglasses he most certainly would have lost his right eye.
Granted, he is at fault to some degree for not wearing a face shield/helmet, but it was just a freak thing that happened.
Long story short, wear PPE! It isn't worth risking your life for $150 worth of chaps, gloves and helmet. It's a hell of a lot cheaper than an ER visit, not counting the $12/mile ambulance charge. Please guys, wear it if you have it!