Not saying other manufacturers make less stable phones. Basically I'm implying that 5.1.1 is more stable than Marshmallow at this point. I still have Bluetooth issues with the 6P, plus occasional app crashes and incompatibilities. I don't have that with the Priv. I also don't have the occasional slow downs that my 6P has (still have to reboot mine 1-2 times per week to keep it running at full speed)I honestly don't find the software on the Priv to be anymore stable than any other Android device I had/have that was released this year. I will agree that it the best of both worlds if you need or foresee using the PKB.