"Everything Has Changed"
Apple really pulled out all the stops with this update. For one, the megapixel and processor boost then the 3D touch. Count me in. If you don't believe me, take a look at the photos from the iPhone 6s! Also, yes, if you want Optical Stabilzation, you'll have to opt in for the 6s Plus. Now if I could decide which case to get.
note: I'm still using an iPhone 5 at the moment so an upgrade was due a year ago