All the heat, sweat and strap rubbing. The funny looks all the time! TOTALLY WORTH IT for the few seconds that it is there when put into crash service. I have destroyed several motorcycle helmets and two bike helmets and would not be a functioning human being if I was not wearing them. When riding, everything is great until it's not and no-one can control every situation out there so put a lid on it!
My last incident, I had just enough time to mentally say oh **** before I got whacked by an oncoming motorcycle. You are living in denial if you think you can control your own safety out there. A little protection goes a long way.