I'm past the point where I am willing to debate the merits of minimal shoes----it has made such a difference in keeping me healthy. Skeptics can say what they want.
My question was about running distances faster.....
That said, I will share an anecdote:
I've been running in the Asics spikeless xc shoes for all of my runs for about three years. During this time, I've had almost no leg issues. Preceding this change, I had partially ruptured and achilles, had p.f., stress fractures, i.t. band problems, and a load of other maladies. I wore orthotics with motion control shoes. In between injuries, I was racing 10ks (usually in the 31:00-31:30 range).
Finally, I had it with the injuries and the shoes that were supposed to prevent them. I started from scratch wearing (on advice from Lydiard) as little on my feet as possible. At first, my calves were hamburger----I ran no more than 35 minutes a day for the first 30 days. Slowly but surely, I've built back to my higher volume. (I ran 31:30 in the h-street last month).
I'd been having a hard time finding the kind of shoes I wanted for the price I'm willing to pay, so I picked up a pair of Asics Gel Magic Racers on a whim and to fill a void in my shoe collection. Within two weeks of training in these, I had massive achilles pain, a nasty tightening of my psoas, and a crazy foot pain.
It actually took me a few days to figure out that it was probably the shoes---the Magics are light and at first glance seem minimal to some. I went back to my hstreets and an old pair of Asics spikeless-----the injuries disappeared within two weeks.
The issue for me is heel height. Even though the Magic Racers are lighter than the Asics spikeless, they are much chunkier.
For doubters of the minimalist shoe movement----I am a doubter that I could ever train in "regular" training shoes again.
I can not yet do long, long runs on the road in my h streets. Before I run a marathon on the road, I want to be able to do a three hour run on pavement in the h street.
....too much information, I know.