I've had mine for 3 weeks, just had #6 replaced and I nuked another one on the way home from Denver. Not sure if it's the same one or not because I haven't had a chance to put my scanner on it yet. I still have some ESP left on it so back to the Ford dealer it goes.... Service manager said he'd do what he could to make it right without me having to pay another deductable.
It's all good though... I knew about the coils going in and when I drove the car for the first time I decided I was willing to deal with it. Wish I would have been a little luckier though. The first one started acting up on the way home from buying it from a private party.
I'm thinking about carrying a "coil kit". A fresh coil, a boot, a spark plug, some dielectric,and the required tools in a small box in the trunk.