I purchased these on Monday morning, and wore them around the house that evening to see if they where comfortable under normal conditions, and they are.  This morning (Tuesday)I wanted to test them out on an early morning run of 4 miles; I hit the four mile mark and found they where so comfortable, stable and fairly cool that I decided to add two more miles to the run.  If I was not going to be late to work I easily could have added several more miles to the run in comfort.  I am a rather heavy runner, 205lbs at 5'10" and my forty year old knees let me know when I'm pounding the pavement too hard.  I was very comfortable running in these shoes, a very natural stride and a no sense of the shoe trying to correct my over-pronating, I was just able to glide along without worrying about my feet or knees.  The sock liners in these shoes are smooth and seam free, so no "hot spots" that I notice in my favorite Adidas Supernova Control running shoes.  I'll write an update after a couple of road races in the next 30 days (Race Gloucester and the Trail to Ale, MA & ME respectively.)