After losing my last helmet (longer story then I would like to get into here) I stopped by my local bike shop to replace it. To my disappointment, they did not have Giro Atmos helmets in stock. Not wanting to miss any more days of riding, I grabbed what they had instock.
I was a bit skeptical of a $100 helmet, but it did really surprise me. Comparing it directly to the Atmos, while not a fair comparison, the only one I can make. The ventilation was not quite the same, but by no means poor. I do have to say, that the sizing adjustments on the Circuit were much better then the Atmos at nearly twice the price. I thought the fit and fell of it being on your head was fine. No pressure points and it felt rather light.
Buying this helmet was no disappointment, and makes me consider putting off replacing the Atmos.