Can/do you run on concrete with those things? Seems like that would hurt.
haha well you hit on the whole point of pose figure 4 running...
most people run the wrong way... technique wise anyway... they strike heel to toe which ruins your joints, tendons, everything is affected with the constant blows your body endures when you run that way. especially on concrete.
vibrams, barefoot running, flat bottom shoes are basically trying to get you away from running heel to toe and back to the way the human body was designed to run; which is basically falling forward on your toes... just pulling your feet off the ground with your hamstring right to your butt, and then placing them back right under your body and you move forward by leaning forwards. most running shoes will have thick cushioning on the heel (shox, nike 180s/360s) to compensate for a bad running style.
i've gotten a couple pm's asking me for videos and instructions on this so i'll just post the link here to where i learned everything.
http://www.crossfitendurance.com/page/index.php?menu=demos&page=videos
it is absolute gold. its very weird to make the switch but keep with it and i promise it will revolutionize the way you think about running. any questions just pm me. if your not getting it on your own i would call up a crossfit box in your area and tell the coach you need some help with your running and they'll get you squared away