6S really doesn't have any real must have festures. If you don't have a 6 then go for it. Hopefully 7 will be a killer iPhone
Disagree. The extra gig of RAM will be VERY useful in iOS 9. The A9 is a very nice chip with much improved graphics ability. Probably no power savings as it's still 20nm. We will have to wait for the 14nm A10 for the next be efficiency jump. I could care less about Force Touch. However, there are many little changes in the new chassis. But we will have to wait for the tear downs.
