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 pain is worth it -- I'm now walking with a better posture and with more natural-feeling movements, even in my socially accepted shoes.