T-Mobile already has android 5.0.2 lollipop. If you use a car mount that holds the phone in landscape position with an app that forces screen rotation, like ultimate rotation control or rotate screen orientation from google play, you will find that they have ruined the user interface, particularly at the home screens because widgets cannot load in landscape.
In call UI is missing all 6 buttons in Landscape orientation.
I drive for a living, I updated my phone, I really liked the new version, I installed my rotation app, I discovered all of the flaws within seconds, It aggravated me for almost a week so, I downloaded the resources necessary to flash 4.4.2 back to the device I am happy again I just have ignore the prompt to update to lollipop.
My point is-- If you also like landscape to use it like a tablet or in a car mount in that holds it that way don't do it unless your curious and have the skills and resources to roll it back.