I wear these every day at work and I mostly stand/walk around a very large manufacturing plant and they are so comfy.

The ONLY gripe I have (and obviously it isn't enough to dock a star but YMMV) is the shoelaces.  They will not stay tied.  Period.  Single knotted they untie in less than an hour and double knotted most of the time I only have to retie them once.  It's worth it to me to put up with it though because they are THAT comfortable.