Adding GPS is interesting if its light weight and the battery actually goes 9 hours which is really short IMO.
Putting a camera, GPS, HUD and a battery can't be good for weight compared to the mirror type. Plus you will need speakers. Then the thing goes dead on your way home at night, hopefully it can be plugged in while riding? The mini-usb would probably not work well plugged in while riding.
I guess it has its place, but I lean towards the mirror designs for a KISS approach. This Skully would have to have a removable battery pack arrangement or a charge while you ride feature for me to consider it. But, it looks like something more to break to me. I want to try a mirror type, no batteries, no electronics!
But, these new rear view helmets probably won't fit my narrow head anyway..