Has anyone seen and/or tried the Reebok Travel Trainer? (see BBC page for a picture http://news.bbc.co.uk/cbbcnews/hi/sci_tech/newsid_2210000/2210275.stm
). Apparently Reebok spent £2m designing a lightweight shoe that can be folded up into a ball for travelling but is still a real running shoe. Sounds like a great idea, but it doesn't look very substantial in the picture.