I've been meaning to order a new one for a while (AC-10X IIRC in the UK). The outer black plastic of the lead about 10cm from the USB connector is cracked in a few places and exposing the other leads inside. Still works but not trusting it 100% as a result. Still, after years of use I suppose it's allowed to be a little worse for wear. It has never suffered from being filed down, the USB charger in the phone is still rock solid without any mods to strengthen it.

On a similar note, the Ethernet lead to my router seems to be suffering a similar fate. For some reason the black solid(non-braided) plastic outer casing has started to, for want of a better word, unravel. Imagine pushing the ends of a twisted rope together so the middle piece becomes loose, that's what its like.

Makes me wonder if at this rate I'll have to start treating all the leads for PC/Laptop/Phone with something.