A full face Shoei X-8 saved me from certain facial reconstruction. In 1997, I was turning right onto a side street in DC. A nice lady in a car decided to pass me on the right as I was in the turn. My '95 R1100GS was totaled with a broken swingarm and punched-in gas tank. I landed on my head and chest. I had a mild concussion but no broken bones. Helmet has an abrasion from the top of it to the bottom of the chinbar. I keep it as a reminder to always wear a helmet.
I also ride mountain bikes and have totaled several in the last five years. I would rather replace an $80 piece of foam and plastic than go through rehab. I feel the same way about motorcycle helmets. I wear a Shoei RF1000 now. Next year it will be time for a new one.