I am a 38 year old runner/racquetball player from minnesota. I have been minimal for about a year and a half. It is super hard to get barefoot runs in wintertime here. I spend a lot of time on the treadmill.
I have used 10+ kinds of minimalist footwear for running.
my favorite is bare feet
2nd favorite vibram five fingers
there is a bunch of junk out there (zep's beach shoes lasted about 50 miles, my ghetto sawed off heel running shoes sucked too.