I have several (6 or 7)open faced helmets ... my two cents on the Momos:
I have the Momo Fighter model.
The build quality is fine.
The windshield is crap - bad wind protection (aerodynamics and leaks from top and especially bottom due to not being plush???) and the shield sort of pushes down on your nose.
Momos are not built by MOMO but by Bell (Italy) or Bieffe (I think it's BELL).
Most important - they're extremely hot in warm weather (for speeds up to 50mph/80kph) and have no ventilation.
Practically speaking ... it's a designer helmet and nothing more.
I wouldn't buy one again.
Amongst all my open helmets, the best is a Nolan N41 - it's well built and HAS ventilation.