My understanding is that Shure will replace the IEMs if the cable cracks, so if this pair happens to be one of the old batch, if it ever fails, you'll get a new pair with a better cable.
About the Complys, they are comparable to the black olives in terms of comfort, but they deteriorate much more quickly. Also, they're grey, so it becomes quite ugly after a week or two of daily usage. Medium olive foamies are my tip of choice.