I must say that this phone is a best, price is expensive but such a premium class phone nobody can give anyone . Comparing from tip to toe, everything is great .
Pros -
Camera quality awesome, specially slow motion recording!
Performance is very smooth, no lags!
Graphics are great!
3-D touch feature is very useful!
Cons -
Just one thing - that you can only transfer files between apple products .
Just give it a shot for 6s and see for yourself!