Seems like the backside of only a single link on my SB Link Bracelet is defective. Only that link, and only the backside. But it is most definitely the DLC wearing off (in an interesting pattern, almost like an acid has eaten at it), this is not a deposit on the DLC. It's down to metal. AAPL wants the entire band back for the quality program, has sent a complimentary sport band to use while they're swapping out SB Link Bracelets. Pretty great CS experience...while I wished they'd just sent out a replacement SB link bracelet and let me send the other back, I got a free Sport Band of my choice out of it, so being link bracelet-less for a few days is alright I guess, although I never bought a sport band b/c I don't really ever want one, I guess it'll be nice to have on hand in case I need it or want it for some reason... Had AC+ on the device, not sure if that makes a difference, it's clearly a defective link, so AAPL should theoretically act on replacement with same ease/speed. Regardless, they were great about it.