In terms of the money it was purchased for (250 euros), it is a great buy. It is the lightest option available, with good visibility and quite silent, although not as much as some others. Coming from Arai, this seems quite quiet to me. It also has good aerodynamics. It has good ventilation on the top of the head, but not as good in the front. My scooter is a 350cc. The only drawback I find in this, as well as in the Suéi (which I did not keep but sold), is that in order to keep the weight low, they have reduced-narrowed the back surface of the helmet, causing turbulence to freeze your neck. This can be solved by wearing something (scarf, etc.).
Edit 14-12-2021
An annoying aerodynamic noise occurs when the visor is closed and only when I'm going slowly. It probably comes from the point where the visor attaches to the helmet, only on the left side. As soon as I put my hand there, it stops. So I deduct at least one star