I have an older family member on an iPhone 4S. They have had it 2.5 years. I was considering putting them up to an iPhone 5C. They would get the SLIGHTLY larger screen and a bit of a processor speed bump, plus a shiny new phone. I would like to get them an iPhone 6, but it is $220 more (considering additional tax too, and $220 feels significant right now). They are not a particularly tech person. If I don't get the 5C, they will probably have to keep waiting 6 months to a year to get another phone. Does the iPhone 5C have any inherent flaws or defects? Does it always crack or have some technical issue that almost always comes up after a while? Thanks!!!