Jürg Sieber, adviser at Nahrin, Widnau, Switzerland

There are some who say that it's so spongy, they can hardly climb the stairs any more. But I haven't had any problems at all, myself. It's like when you get bifocals: them first, too. Because the distance is quite different to what your eyes are used to. It's the same with everything. You just have to get used to it a bit. Now, if I'm not wearing kyBoot shoes, I notice the difference straight away: it's like having to walk on boards. That's the problem. Now, if I wear other shoes, of course it's very often harder and sometimes I have the feeling as if I'm walking on the tarmac with bare feet. That's simply the difference. So I'm a huge fan; they're really something great.