These are my first minimus/barefoot style shoes and I really like them. I bought them for trail running, but I haven't run with them yet because when I tried them for the first time they felt so comfortable that I decided to wear them for my everyday routine. So I used them all day, very light weight and no pain at all.
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Update 08-sep-2012
I run a Merrell Challenge (8k trail) with these shoes and they were really comfortable, no pain, no injuries. Definitely a must have, but be careful they turn very slippery in wet surface.