I know a lot of people were not happy with Lollipop on the Moto X (2013), the Moto forum was all a buzz before the upgrade arrived and now it's quiet and dark, lots of disappointed poeple. Here is something I have noticed: the second major OS upgrade sometimes kills off a phone. My Bionic was great on the original version, and then OK on the first upgrade...then it was terrible on the second upgrade. My RAZR M (all 4 of them) were great on the original version...just OK on the first OS upgrade and then horrible on KK. Maybe the battery is just too old and worn out by the time the second OS upgrade happens? Anyone else notice the same thing in recent years?
I had a RazrM too, great "little" phone. I could go two days on a charge. Got it with ICS, went to JB and KK, all went well till the very last KK update, to 4.4.2. Not battery life issues, as by then the phone was already two years old and starting to visibly have shorter time per charge.
It was more annoying problems, like the screen freezing at random at a 45 degree angle in the middle of a screen rotation.... Only remedy was a complete reboot with the two button "virtual" battery pull.
Another annoyance was the home screen icons popping up slowly one by one on the wallpaper after I closed the browser. It must have been a RAM issue, as it was worse if I had browsed for a long time, opening multiple tabs or visiting website with lots of pictures.
Too bad, because other than that I sailed smoothly through all of the OS updates.
Crossing fingers, so far so good with the Turbo. It got L just few days after I purchased it, so I didn't have it for long enough with KK to say if going to L had significant drawbacks.
One thing that was annoying at the beginning was all of the system screens background going from black to white.... Now I got used to it.