I purchased the black Keen Presidio shoes for a trip to Ireland and Austria this past October.  The shoes were fantastic, especially because I was three months pregnant at the time and they offered all of the comfort and support I needed.  Up until last week, the shoes have been extremely comfortable, even though my feet have swelled up significantly due to my pregnancy and upcoming delivery.  Now, unfortunately, the swelling in my feet has become unbearable that the shoes don't fit me well anymore, but overall, I would recommend them for comfort, pregnant or not.