I want to like Samsung, and I used to have an S III and it was great in it's day but they need to step up with their security updates. They provide 3-years of updates now I think which is better than they used to be, but for a lot of security-minded people I think a portable computer with a lot of sensitive personal data is pretty much obsolete the moment the critical security updates stop coming. For me that means I could only have a Samsung phone for 3 years before it would need to be replaced.