I also agree with that. Just as with chainsaw chaps however, I would prefer to depend on other precautions first.Where I last worked, all the table saws were the SawStop saws, I was told the insurance company required them. The cartridge that stops the blade is a one time use only and is trashed to stop the blade. I believe it costs about $125 to replace, as others have said, mighty cheap insurance to save a finger/hand.
OTOH I once knew a woman who cut her leg badly with a circular saw... remember the old Black and Decker tools with the pigtail power cords because they were allegedly safer? She didn't want to take time to get the extension cord.