Interesting. I’m actually in the market for one. An iPhone 6s plus.
It’s a dandy.
I had some gripes on a nuts-and-bolts technical level with the iPhone 4 and 5 models and attempted to go the Samsung/Android route which was like walking a mile in bare feet on a hot road with sand in my swimsuit.
Quickly went back to the iPhone. In a happy coincidence iOS 9 sorted out many of the issues that I had before.