Short version - It's the nicest helmet I've owned and I've owned a lot. It replaced the previous 'best in show' Arai Profile and that was no small accomplishment.
Pros -
So light and aerodynamic it's has to be tried to be believed. Literally transformed my riding experience.
Transitions auto-tint shield is fantastic
Low noise compared to Arai
Cons -
I'm an Arai Long Oval head shape and this is rounder. I ended up make a very minor mod to the front section of EPS to accommodate my forehead.