My 6s just turned 2 years old and it's still a great phone, does everything I need and performance is still good. My contract is up in September and I will probably upgrade because with our carrier my rates stay the same and if I buy a new phone the monthly cost stays the same, otherwise I would just keep using the 6s. I'm hoping the 8 is still available in September as that is what I would upgrade to because I like touch ID.