I’ve had my Vibram FiveFingers KSOs for a few weeks now, and have reached roughly 50 miles in them, including a single 25 mile week. At this point, I think they’re great. There’s a freedom to running in them, as you truly feel everything under your feet. I feel faster and lighter on my feet, and my pace is faster for a given effort level than it feels.
The downside is that barefooting really works your calves. My calves continue to be tighter and more sore than I ever could have imagined, and although there is some improvement, it’s still to the point where I’m nearly hobbling around the day after a 8.5 mile interval run. Today is supposed to be a 9 mile easy run, but I’m taking a rest day as there’s simply no way I could do it. Additionally, I’ve torn holes on top of both of my second toes from scraping them on rocks, concrete, dirt, etc. I’ll probably need to patch them fairly soon. That said, I’m sticking with them for the time being. Hopefully by the time I hit 100 miles the soreness will no longer be an issue.
On a side note, I’ve been using thedailyplate.com for the past few days (which is a part of livestrong.com now) after being turned on to it by Nate, and it’s already an obsession. It’s a great way to set goals with exercise and calories, and accurately track how you’re doing on a day to day basis.