All done and working fine - only small snag is that you can't use the "wind protector" on the chin guard as there's so little room between the chin guard and face that with the microphone installed it's not possible to open or close the helmet if the wind protector is fitted. In fact it's quite hard to find a position for the microphone where it doesn't rub against your face.
Went for a spin this afternoon and helmet is comfortable enough, about as noisy as my BMW System 6 Evo, maybe a bit lighter. Having tried both I think I prefer the System 6 for ease of use.