I have been using a C4 every day for a year now.
Goods points: v quiet, great visors, comfort, weight
Bad points: anti fog visor works loose (on 2nd one and wife’s the same also), poor ventilation through both vents, lower vent more of a gimmick, having to have the wiring re done in USA for intercom so bluetooth now connects, having to pair every time we switch on
Hoping the Pro version resolves some of the issues.