I bought a pair of the Terra Plana Vivobarefoots a couple of months ago and I love them. The feeling of running barefoot or in minimal shoes is amazing, and for me it meant I was tempted to go too far and too fast, too soon. 
I'm now having physio for compartmental shin splints and a possible stress fracture, so I've learned that it's essential to build up barefoot running extremely slowly. If you're already a forefoot striker it might be easier (I was a heel striker).
I was used to running 6 or 7 miles, so I figured 3 or 4 would be OK: it was way too much.
However, on the plus side it's true that barefoot running does teach you to understand your running style and its faults better. I could feel something wasn't right on my right leg, and the physio has now confirmed I'm misaligned on that side as a result of an accident I suffered years ago. If it wasn't for my barefoot running (and the resultant injury), I would have gone on running incorrectly for years!
Now I'm learning how to correct the imbalance, and hoping to return to barefoot running soon!
Anne