I've got two Air Attack Shield helmets. A white one for summer riding/racing and the hi-viz yellow for fall/winter riding/commuting.
For the Hi-Viz Yellow
great color for being seen
great helmet in the rain - shield for blocking out rain without fogging up and my head stay warm, I can get away with wearing something over my ears
easy to use shield - never rattles, solid magnet contact
Zeiss optics are very clear
surprisingly cool when it's warmer out
-at high speed, I've moved my head around quite a bit to find the right position but I still get a lot of turbulence behind the shield and over my eyes
-only comes with the one lens...the tinted one which isn't useful for the PacNW. I own a full-on mirrored yellow one when the sun comes out and a clear one for when it's dark/rainy
-expensive when you don't buy it on sale
Light and comfortable. Very adjustable fit - accommodates winter cap. Seems sturdy and stable. Use it for road riding and feel safer because of the high visibility orange color. The one negative so far is that because of the koroyd inner shell I haven't found a good way to attach my safe zone mirror.
I have been using Giro helmets for almost 20 years including the Pnuemo, Atmos, Ionos, Aeon and now the Synthe MIPS. The Synthe is the most comfortable helmet I have ever worn. It is not as light as the Aeon but because of the fit and the excellent ventilation it feels as light. I ride 200 miles a week in the Phoenix Az area and really appreciate the fit and ventilation of the Synthe.