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The uber weight weenie helmets come in at around 185g I think. Theres a good chance this 15g saving is at the retention system, and internal foam. I'm not sure you'll do better in terms of fit/Comfort : weight ratio than an Aeon. Wont be much different at least.
My Octal is a full 100g lighter than my Giro air attack (I did also size Down). I'm an ex rugby hooker so my neck is a trunk. But I can definitely feel the difference.
OK so nothing better than aeon.
I think for 30% reduction in weight is a lot and it's really worth it.