If you're the sort who does interesting things whilst wearing a helmet, things that you might like to capture on video for friends, family, or strangers to watch, it's an awfully good time to be a gadget lover. There have never been more helmet camera options than there are today, and one of the most interesting we've yet had the opportunity to affix to our lid is the Tachyon XC 3D. It's a pair of generally pedestrian cameras that, when joined at the hip, combine Voltron-like to do something rather more interesting: capture 3D renderings of your extreme endeavors. But, is an extra dimension worth the $380 price of admission? Read on to find out, and to experience the depth for yourself.