Size issue- but great pick.
I've only ever worn full-face, but I've decided risking an East Texas heat stroke isn't worth it. I wear a Large Fly Racing full-face and I have a Large Giro snowboard helmet. Logically, I ordered a Large Giro Feature, but it was just a little too loose. HucknRoll exchanged for a Medium with no issues and it fits great.
That aside, I've worn it for a few months now and I really like it. It gives me more security than a traditional XC offers and it takes abuse. I dropped it on my headset and it left a tiny dent in the outer shell, BUT there isn't even a scuff from a gnarly steep OTB into a tree where my bike flipped over me and bounced off my head behind my left ear.
Final verdict- I am VERY impressed!