I'm wearing the Akuma, in flat black. I think its great! The air vents allow quite a bit of circulation through the helmet and even though the ambient temprature here in San Antonio has gotten above 100 a couple of times in the last week, I've not been drenched in sweat, yet.
True there is no integrated sun visor, but a cheap pair of sunglasses under the helmet does the trick for me. If it gets too dark, just pull over and take off the sunglasses!
The fit is a bit snug on the cheeks, but the helmet is only two months old so it will probably loosen up over time.