After owning a stalwart iPhone 4 for 3+ years, I have been extremely disappointed by the 6 Plus. I have had two physical failures in 18 months which have warranted Apple replacements under AppleCare. Consequently, I have decided to sell it. The question remains: What do I buy? How much difference in performance is there between a 5SE and a 6S? Has anyone gone from a 6 Plus back down to a 6S or even a 5SE? Are there any general trends about the reliability of the 6S Plus, 6S or 5SE models? Are there specific issues plaguing certain models?