I'm mostly concerned with water and salt. They will start creeping into the soles once the separation becomes larger. I should also note that there were several other small separations like that throughout the soles.
Ok, I have some bad news. The soles of the Amsterdams that I ordered via UrbanDaddy a few months ago have started showing cracks. Has anyone experienced the same problem? I already sent my back to AE for repair. I hope mine is an isolated incident and not a problem with the design of the new sole.
AE has their annual Rediscover America Sale around Sep. Besides clearance, this is the best time to buy AE firsts (Nordstrom sale is good but the selection will not be as good as AE Rediscover Amercia). AE has seconds sales several times per year, some are advertised, some are not. The best place to stay informed about AE sales: this thread.
Here are some quick snaps of my Tan Sandersons and Brown Slatons. I can't believe I got them for $130/pair. They are fantastic. Both are double-soled. I love the Sanderson, very handsome shoes. The Slatons are like the blucher version of the Fifth Ave but the cap toe is much better proportionalized. Overall, I'm very happy with the purchases.