G'day,
http://www.gizmag.com/icon-airframe-statistic-helmet/31792/
I have to admit I'm a full face kind of person, and with a helmet like this which shouts out that 15% of helmet hits are on the chin area...
Anyhow, I'd rather not start yet another debate on that point! I just thought it was an interesting helmet and wanted to share the link. Everyone will stick to their opinions plus their own perceived and acceptable levels of risk.
Cheers!
P.S. I wouldn't personally wear such a helmet, but I don't like talking to people and it's a bit of a conversation starter.