Amazing helmet! I already own an AGV GP Tech Marco Simoncelli and it’s the same fitment and function.
One thing I notice while on the track is that it seems that I wear the helmet a bit low on the face/cheekpads. It reduces my upper field of vision, especially in high-G turns. So, I added some material to the upper liner to keep the helmet from sliding and in position. It worked! I am between a small and x-small sizing.
I highly recommend this helmet!