$99 at Amazon or AT&T. For the price it's a good deal. I'm assuming you've read reviews and researched the phone. The display is adequate, same with the camera. Actually quite satisfied with both.
With Win10 installed, I put most apps and all data on my SD card. Don't anticipate problems with OS updates as I keep most stuff on the card. Did I mention it's $99? Not quite an impulse buying price, but close.
I download pdf's and read at work during breaks. I use it to do light web browsing, MP3 player (surprisingly good sound), some navigation, and as a phone. It does all of these things well. It performs well, doesn't freeze, and is reasonably quick at most tasks. It isn't my main computer (I've a nice desktop) or the center of my life (though I spend more time playing with it than I should). . I bought a couple of oem flip covers in different colors, and a 64 gb card and am quite content. It's been a dependable device that I didn't feel guilty spending the cash on. Had a 640 before this, my wife and daughter are still rocking 640's.