Been running the update all afternoon;
so far:
Phone is SO MUCH FASTER Night and day difference
Hasn't dropped a call yet.
Wi/Fi calling appears to be working great.
NO echo on Wi/Fi calling
Fonts appear bigger
The only 2 things I have notice that aren't a plus; Battery seems to drain right before my eyes
Whenever the phone sleeps, when I touch the screen, where the weather widget is, is says "no weather available". As soon as I unlock it, it updates and is fine.
So far, in just a few hours. It seems Tmo got this one right. This is how a phone is supposed to act. With any luck, the phone will actually work the final year of my 2 year contract