I am in the process of rolling mine back to 10586.164 now. Got tired of the simultaneous failure of iris scanner and keypad making it impossible to unlock. It happened at least five times today.
SMS: most of the time the arrow to send is missing..
The Bing lock screen on my 950 XL has stopped working since build 14291.1001 as well. Worst thing though is that the battery is draining VERY quickly despite my best efforts to save battery life. The phone is very hot! Even with the phone on battery saver the battery drains stupidly quickly. I've tried turning off Glance screen, unpinning live tiles from my start screen and nothing seems to work