Okay, here are a few preliminary impressions.
Surprisingly good. This is an important feature for me because I do mapping work. I almost didn't buy this phone because of all the complaints about the GPS that I read. But then I realized that literally every other phone in the phone-using world had just as many or more complaints about GPS, so I decided to try it for myself.
Bad GPS would have resulted in my returning this phone, but it actually did quite well. With all four systems in use, I tool it for a roughly 20-mile drive through an area that practically all GPS receivers have a hard time with because of the topography. It maintained a 3D fix with 3-meter accuracy for the whole length of the trip, which is outstanding.
I also tried to test it with Magic Earth, but being your basic idiot, I forgot to download the offline maps first; so that report will be forthcoming.
I'm probably not the one to comment on that. I'd use a brick phone if it delivered the best performance.
Seems okay when talking to myself from one of my other phones. Maybe a tad tinny, but not horrid.
I can hear the GPS voice over my car's Bluetooth system, which is all I care about.
Three bars on ATT, which is about average for where I live. I'll check the actual signal strength later.
5GHz works well anywhere in my house, which was all I tested.
So far, no deal-killers.