I leave them off.
But there has been a few days when I havent been able to catch some, so they keep their's on for a night, and they seem to learn.
Yes if they are properly fitted there shoudnt be problems, but its like a lot of other things in sying that. And yes freak accidents do happen.
But its all to ones own prefference!
When you mix training and dedication your called... a professional
When you mix compassion and caring your called... a friend
When you mix bravery and selflessness your called... a hero
When you mix all three your called... A FIREFIGHTER!