I don't mind the GPS (sounds interesting, actually)...I do mind the size of the goggles (tried them on and they were stupid massive) and the $650 price - I've seen last years Zeal recon for less than half that price
These goggles are horrible. Tried them on and hated it. There is a contraption on the bottom corner of the goggles where you focus in on to read the display. This causes you to lose focus of what's ahead of you. It also adds weight. And because it's a piece of tech sitting right below your eye, it could hurt if you faceplant. Unless you like having a little led display shoved into your eye.