I own a pair of vibrams. I wear them all the time. I find my feet EXHAUSTED at the end of the day if I've been up and moving lots as well as wearing Briggs. Do your feet feel like that too? It feels as if I have sore muscles in my feet. It doesn't extend over to the next day nor do I get it in my normal runners. Are my feet STILL getting used them? I wear them 6 days a week at least. Anyone else experiencing this? Any advice? Should I try a different type of barefoot shoe or go to something else?