Just sat through their KS video. That thing looks like a pretty bad contraption. No one using it appears to be comfortably "walking" or moving in any way.
I know I'm not everyone, but when I play a video game, I don't want to be exercising (or doing much other than WSAD and moving my mouse). When I'm exercising, I don't want to be playing a video game. I want to be focusing on my workout. I don't think anyone who doesn't exercise and plays video games is going to change their exercising habits with a device like this. Much less be able to afford one.