I had the C3 Pro. Kept misting up. It went back to shop for replacement pinlocks x 3, went to tran am x1 for repalcement visor surround, went to Schuberth afterwards for new refit. Still misted up.
Water also gets blown up the inside when closed (not a lot, but enough to give you a fright now and again). The outside chin vent works on the principle that air is forced down the funky visor then gets re routed into the helmet up along the inside of the visor. Great if you are moving...Doesn't work if in traffic, going up an alpine road in pissing rain. Crack the visor and the top loses contact with the rubber seal, so water runs down on inside of visor. Other than that, hot (be nice now though mind as it seals a lot of wind out), quiet, comfy and nice size, big viewing size outside vent. I returned mine for a full refund.