Bought these around 3 months ago, the black and white ones and they are fantastic. I was aware of the natural running movement but basically bought them on impulse because they looked funky! They are however extremely comfortable and enjoyable to wear, like wearing socks as they're so minimal and it really feels strange when I have to wear heavier footwear. [how about some with little individual steel toecaps for work, Vibram? ;)] I have worn these for running, long walks on the South Downs, out casually and all day long and really can't fault them. I wear them every week in the gym and for circuit training and they feel fantastic for that, I definitely feel more sensation and control, hard to explain. I am still building up running in them, as it takes time to adapt to running on the balls of your feet but can already confirm that they don't cause knee pain, unlike in traditional padded trainers which encourage me to heel strike.
Three things to mention;
Wearing them without socks means they quickly get stinky and need throwing in the washing machine every other time you use them. (Was actually on here to get some five toe socks! Will review those when I have them.) They come out looking good as new each time though, which is a relief.
Not sure if they'll be warm enough come the wet winter..? :(
Be prepared to have people stop you in the street and ask about them and for others to blatantly point and stare! Some people are properly spun out by them, others are curious and plenty think they're cool too. Wearing them at a party or the gym, any social interaction really will guarantee plenty of conversation!
I got these because they were the best styled, like trainers at first glance, some of the others look like divers shoes. I hope Vibram come up with some more 'street' styles, tempt more people into them and I want some more!