Since the Givi gives me a nice air pocket around my helmet, I usually ride with the face shield up. Once I did get a big bug inside the helmet, made it straight through the air stream. I could feel it wriggling around, digging it's little claws into my temple. Fortunately it was not a stinging bug but I didn't waste any time pulling off the road and getting the helmet off. I really should keep the shield down more often, because of the stinging issue, and if that bug had hit my eye (1" over) I would have been in big trouble.
2014 V-Strom 1000 - Desert Khaki
2011 Burgman 400
2007 Honda Helix
2013 V-Strom 650 - sold