I love theses shoes, but I have a terrible time with the stitching located on the inside by your arches.  The rubbing against this area causes blisters.  I have terribly flat feet, and was told that this would be a good investment.  I do love these shoes, and use them for various activities, but I try not to use them for any sport activity for more than 30-40min periods because of the blister thing, unless I'm wearing toed socks.  I just wonder if the other brands would have the same issue.