I love the back-plate's material and the user replaceable battery!! those are some very important features that gives a smartphone more longevity, the screen is good, but at 5.5'' is hard to notice the difference, the camera is also very nice, that laser focus technology it uses is very innovative.
I think it's an excellent phone, as a developer it would be great to have one, and make apps that take advantage of all those features.
Greetings from Mexico , good luck to y'all