I (Moto X 2014) got a different set of bugs on M. Mostly problems with basic functionality:<p>- When I get called, half of the time I don&#x27;t see the name of the person when they are in my address book.<p>- Music controls (which were already very basic) usually stopped working a certain amount of time after the last restart.<p>- Music randomly pauses when browsing the web at the same time (as in, I have to open up the music notification card and press &#x27;Play&#x27; again).<p>- E-Mail notifications have been flaky for some reason.<p>- Active display music controls are worthless again. Google decided to add a &#x27;favorite&#x27; button. Motorola just picks the first three buttons from the notification card. Now you can&#x27;t go to the next track anymore.<p>Security updates were also still at the 1 November 2015 level. After being stuck for half a year on a buggy 5.0 release before getting 5.1, I know this is going to take months to fix, if ever (Lenovo probably doesn&#x27;t care about the 2014 anymore).<p>I am now back to an iPhone after a Nexus 4, Moto X 2013, and Moto X 2014.