For me the biggest concern I had when I looked at this was to what degree it could compromise the safety characteristics of the helmet, in particular: 1/ Anyth

For me the biggest concern I had when I looked at this was to what degree it could compromise the safety characteristics of the helmet, in particular: 1/ Anything that reduces the amount of compression available from the internal foam will significantly reduce the main benefit of a helmet in reducing brain damage. 2/ Anything that increases weight will aggrivate the main drawback of a helmet (giving your head more leverage to wrench your spine in an accident). 3/ Similarly any tethering or external modules are going to risk wrenching your neck in the event of an off. It looks incredibly cool but I can't help but think it compromises most of the safety value I wear a helmet for in the first place.