It reminds me somewhat of the first 'mobile' telephones; huge great things that needed a massive battery in a shoulder bag. It's big, cumbersome and extremely noticeable. I predict the first ones will be seen 'in the wild', in 1st class sections on 'planes, rather than on the Tube. The price means they will instantly become a status symbol, much the same way the early mobile 'phones were. But technology will improve, and give it 5-10 years or so, and many people will have them. Their potential is huge; from applications in scientific/medial arenas, to helping people navigate wilderness areas. I can see how they could be very useful to those with disabilities. Apple tend to be pretty good at turning new tech into workable, profitable entities. Get ready kids; the future's Augmented.