Just make sure you keep your receipt IQ.
I hope the higher end models have a better build quality, but I have returned about 5 or 6 pairs of E2C's over the years.
You get 2 years limited warranty with the Shures, but if you get any problems, just phone Shure Distribution UK for a returns number.
The E range has just been discontinued and replaced with the SE series.
I can't help wonder if that is due to the reliability problems?