I have the Sena SMH10 headset system. It is AWESOME. I have an HJC helmet with a mount on the outside, I also have the Bell DLX helmet with the built in mount where the SMH10 fits into the shell of the helmet. the exterior mount is quieter. The Bell DLX can have a little wind noise where the wind travels around the Sena mounted in the side of the helmet. Only bothersome on a real long trip and then a well placed piece of electrical tape, stops that.