I know about chatterbox but I ran into another biker who uses and recommends Nady MRC-11X communicater. It looks like a handheld walkie talkie with small headphone and mic attachment that sticks on the inside of the helmet. Does anyone have any experience using it or even a comparable device. The Nady is $69 versus $250 for the chatterbox. Oh and I was referring to the closed face helmets. Thanks.