The first time you pick up an iphone 6s you get the feeling that how similar is it to the iphone 6. But the older iphone 6 design was pretty amazing so I have no complaints as it is carried over. But the new iphone is thicker and heavier than its predecessor as because of the new aluminium and display technology called 3d touch. 3d touch adds a whole nee dimension to the iPhone. The iphone now recognizes gentle taps and deeper presses. The performance is also heavily improved as it packs the new apple A9 chip and 2gb of ram. But it still packs the terrible battery life as predicessor and lacks OIS as compared to the 6s Plus. The touch od is also now twice as faster. On paper the camera looks vastly improved but in real life youll hardly notice any difference. To conclude I would say that go for it if you use ith iPhone 5s or older. But for iPhone 6 users I dont see any reason to upgrade.