Really, when looking at it, there really isnt a great reason to upgrade if you already have a 6S other than the cameras. The screens are the same but a little bit brighter, performance is better, but is anyone really taxing the 6S as is it?
I kind of want to update due to the cameras, the jet black color, and added storage (reaching my 64gb limit on my 6S), but it's not worth the extra $1,000 for that. Though I was tempted to preorder yesterday, but luckily for me as soon as i got on delivery was already into late october for the jet black.
I will probably get one though as soon as i can find a good deal, but definately not worth the full price, especially when i already have a 6S.