I haven't. But those look awesome and so comfortable. I am going to have to look into them.
I found this and it seems interesting.
http://www.fourhourworkweek.com/blog...fingers-shoes/
On another site someone said this
I have the KSOs, and I love them. They are lighter than any other shoe, which you'll feel the minute you put them on. I find it that in them I stride faster and land under my body. The overall effect is less effort and less impact. I'm also faster when I run in them.
If you're running on track or pavement, you may choose one of the open-top models which have better air circulation. But the KSOs are nice if you plan to run on trail or gravel and want to prevent stuff from going in (KSO stands for "keep stuff out").
I suggest getting toe socks as well. Many reviews I read noted the shoes start to stink after a while. So I got a few pairs of toe socks (Injinji sells the technical ones, and if you're lucky you'll find some pairs from plain cotton on Amazon). So far (4 months and about 300km) I have no issues with smell.
In any case, don't start using them 100% at once. It takes getting used to, and in the first runs you'll feel the load on your calves and possibly other muscles. Use them for just one run a week at the beginning, and keep your shoes for the other runs. Over time you'll be able to use them more.
And all of these people seem to love them too
http://www.dailymile.com/forums/begi...-you-like-them
I want a pair now! It seems either way, most suggest getting used to them. Not sure about the weight thing. I'd like to know as well.