Gotta say...after using my 6P for the last few days....I'm kinda disappointed.
IMHO the fingerprint scanner on the back is not a good idea. It is not intuitive. I have to pick my phone up to wake to use it. My 6s+ and Note 5 both can be used from a flat surface because the fingerprint scanner is on the front. I can use my index finger to get into the phones and use them. With the 6P I have to pick it up to get into it.
The camera and software is not quite up to par with the other two phones mentioned above.
The wake/off button is so sensitive. I keep hitting it all the time when just holding the phone. They really need to recess it a little and make it a little harder to press.
The performance is great. It is fast and responsive and very smooth.
But tbh stock Android is just not for me. It is just so featureless. I know its early in its lifecycle but a nice rom like CyanogenMod would be perfect. It might end up on swappa.
EDIT:
Despite the 6P having a larger battery and running stock Android...the battery life is about the same as my Note 5 and TW with a smaller battery.
Agree with your points regarding the camera and fingerprint sensor. I HATE having it on the back of the device. Camera is good but not great, certainly the best ever on a Nexus and VERY usable but definitely outclassed by the Note 5 and iPhone 6+/6S+ (as it should be considering the price difference).
Device is superfast and smooth though. Great device just not for me, I continue to prefer iOS and the iPhone hardware.