While I know people are debating if the 5S is a worthwhile upgrade I think the build quality is top notch. I haven't kept the first iPhone out of the box for a long time. I have owned every version of the phone and will say I'm quite impressed with the 5S. I don't have interlacing, no yellow screen my level works perfectly and the power button does rattle if I shake really hard!! Adding pages, numbers and keynote to the deal makes it a compelling upgrade or at least one I consider worth while. Yep, boring happy customer! Look forward to next year the 6 should be pretty fantastic. Hope the strong resale value continues it's been quite fun getting a new phone for relatively low spend each year.