I think these are the 'cat's meow.' But most people have to go slow with these. I am fortunate because I usually am barefooted around the house and flip flops are my main shoe 90% of the time. The first week I wore them all day and ran 2 - 4 miles each day also.
You do feel everything with the sole of your feet, which is kinda of weird... running on sand you can feel the grains and larger stones, but they don't hurt unless you hit something large with a lot of force. Also debris can get caught in between toes sometimes with is a funny feeling also.
If you don't like talking to strangers, then these are not the shoes to wear in public. People will stop you and ask questions.
Running in soft sand/dirt I am much more balanced. My feet and toes grip and conform to the shape of the ground, while even flats tend act as skis trying to stay on the upper crests of the sand. Much less likely to roll an anke with these.
The only thing I have problems with is hiking off trail in rocky areas. Have to becareful how you land each foot, but the foot is sending signals to the brain, so it becomes automatic. The other thing is that you toes are spread out, and it is easy for my little toes to catch on the side of a stone or rock which really hurts. I am doing some off trail hiking this weekend and cannot wear the vibrams, because one of my little toes is still tender from the last weekend's hike when I kicked a rock by accident.
Don't be surprised if you start singing the Kink's song, "Apeman" when hiking :)