I bought these shoes because I wanted to try running with a minimal shoe. I was new to the concept and I wasn't completely sold on the 5-fingers. I got them a week ago and have worn them everyday since! I am on my feet all day at work and wanted to break them in walking before running in them. For me, there has been no soreness in my calves. I love being barefoot and I love the fact that I can freely move my toes around. I am definitely buy a couple other pairs!