Just a quick update.
I received my 6s plus and I don't think I will go back to android anytime soon.
The level of smoothness is ahead of any android device I've tried, and I already tried a s7 and a 6p. Small stuff like rotating the screen are smooth.
I put it side by side with a s7 and amoled is definitely not my cup of tea. Also it gets brighter or dimmer than my HTC m8 that was already good for me.
Most of apps are the same but with smoother animations, and some apps are better. The battery is the best I've used, 75% now 11am with heavy use since 7AM, I wish I could see screen on time.
Touch ID is really fast, 3D Touch is useful when I remember using it. The keyboard is good with swiftkey like level of correction is only missing swipe. Speakers are better than I expected compared to a HTC m8.
The phone comes with a very weak 1A charger that charges very slowly. I am still adapting to not need to look at the cable when I am plugging it.
I expected more from the camera, is better than M8 but in some cases is not a huge bump as I was expecting.
The device is huge, m8 feels tiny now, reachability is more useful than I thought.
Loving the phone so far.