I've ridden in rain with my C3 before, but yesterday I rode in torrential rain for about half an hour. Visibility was awful and I assumed water had run down the inside of my visor. When I got home and removed the helmet I found water and condensation between the visor and the pinlock visor. That really surprised me as the pinlock had worked perfectly till then.
PS: Also got condensation in one of my Krista lights and the halogen driving light on my sidecar. The rain and wind was the strongest I've ever ridden in.
I got a sidecar to travel with my dog. He never complains, is delighted to be with me, approves of my dietary choices, is a social butterfly who helps me meet folks, appreciates a good beer, snuggles better than my wife, and hangs on my every word as if it's the most profound thing he's ever heard. TravelsWithBarley.com