Giro fits my head differently the Bell. It is not as comfortable, unfortunately I spent $175 on a pink Atmos before I knew this. I had to wear it to discover that while it fits properly it creates a pressure point thus I cannot return the helmet. So that is my word of warning, try it on. I am completely in love with my new Rudy Project Kontact+ helmet that I mountain bike in. Hands down the most comfortable helmet I have.

If the pros survive crashes in the Atmos/Ionos/Bell Sweep (high end helmets) then I good with it. The extra ventaliation is helpful when you live on the face of the sun like some of us.