got this in teh mail the other day so no time yet with actual riding time.
it feels in your hand lighter than any other helmet giro makes, atmos/pneumo/ionos, on your head you barely barely notice a difference in weight.
but for now just trying it on, i would suggest if you are considering it, try it on first. reason being is that the new retnetion system feels sort of like an old school basketball sweatband when you ahve it on. its not nearly as comfortable as teh current roc loc retention system used on all of their other helmets. also the helmet straps have a very very very limited adjustment range, so if you don't like where they fall you really can't do anything about it.