I see the value. For example, I like to monitor my heart rate and speed while running. To do that, I have to move my hand out of ideal running form and look at my watch. With a wearable display, I can continue looking straight ahead to check on my information. Same goes for maps while driving or walking around.
I think a wearable computer that seamless integrates with me will be like having a friend that's always around. If you've ever asked someone, "oh, do we turn left here", then you have a use for a computer that can answer the same question.
