I own a pair of these, and I can attest to what the author wrote: when you run in Vibrams (I own the KSOs), you can run faster and longer than in anything else. He doesn't mention, though, that your muscles will (initially) hate you for it the day after a run. I'm in my early 20s, and for the couple of days following my first "long" run in my Vibrams, I was walking like I was in my late 60s or 70s. That said, the pai…
I find they hurt when running on gravel(nickel sized rocks hurt!) more than anything so I try to avoid that but it might be something your feet adjust to with more mileage. I started at 2 miles and have worked my way up to 8 at a time. When switching back to the KSO's after doing a run in regular shoes the day before you feel very light on your feet because they weigh so little. The most pain for me is that im getting blisters in a couple of places I havent before but I expect that to not be a problem once my feet adjust accordingly. Also make sure you get socks if you are going to do running..you dont need them for regular use but you will want them for long distance running.
EDIT: The KSO's are probably the shoes you want to get if you want to do longer distance running vs the classic (Based on numerous other reviews I read when trying choosing a model).