When my Vibram Fivefingers arrived in the mail on Monday, I was eager to put them on. I have read, however, that wearing them too much too soon can cause muscle pain, etc., because our feet become weak from years of wearing shoes. So, I have used a lot of restraint this first week with the Vibrams. There is a good article about getting started in Vibrams here.
First of all, they are fun! My first walk was for 45 minutes on a flat, paved surface. My feet felt nice and snug and warm. When I ordered, I opted for the KSOs because they cover the top of the foot. I will be using these for hiking on trails and in the woods, so I wanted a way to keep pine needles, twigs and pebbles out. Also, even though I am living in San Diego for another year to study, my real home is in New Hampshire and I wanted them to be reasonably warm. I looked at the Flows for warmth, but decided that since I am in San Diego right now the KSOs were the best choice for me.
I have not experienced cramps or leg pains since wearing the Vibrams. I think that is because I am starting slowly and because I have been doing long barefoot walks indoors to prepare for these. My muscles went through the initial cramps a few weeks ago when I started walking barefoot. I have had the Vibrams since Monday, but have only walked in them twice. I am taking seriously the advice on different websites to start slowly! My only trouble so far has been a small blister on the back of each heel. That seems to be because I had the strap too tight the first day. The second day I kept the strap a lot looser and fared better with the blisters. I am looking forward to my first walk on a trail with these. Flat pavement is one thing, but rocky trails are another. I will be sure to report on how it goes!