Well got mine last night and have been pretty busy setting up and getting used to sense...lol
My initial thoughts are that I like the feel of the device. Feels pretty good in the hand as a whole...definitely better feeling then the nexus 4 that I've been using for the last 6 months
Build quality is fairly good on mine, I'd say a 7 out of 10. No big gaps, a tiny lift of the white plastic up top in between the power and Mic jack, and a tiny dead pixel in the left hand middle corner of the screen. 10's are hard to come by with any manufacturer these days...Anyone who disagrees is either really lucky or doesnt pick up on the little things, but I haven't gotten a perfect phone out of the box in some time. That goes for my last 3 phones, the nexus 4, the iPhone 5, and now the HTC ONE.
As for the actual phone it makes great phone calls, it's a very speedy device, here's my take on a few things...some bad, some good.
The sound is great, very loud and clear when playing music or a video. These speakers are awesome!
Not loving the soft buttons and how you have to touch them precisely in order for them to register a touch.
I feel the screen looks to be a tab to washed out, just my take on it, I felt the same way about the nexus 4 months back and them became very used to it and liked it after a few days, we'll see!
On a personal note I'm having issues migrating from an iPhone 5 where people with an iPhone can't get through to me with a text, it's still showing as going through as an imessage on they're side, very weird. And neither at&t or apple has been able to help...very annoying.
The camera is ok, not great, but not bad. I'll put it this way...Better then the nexus 4, but not as good as the iPhone 5. That's my initial thoughts on it, mabe some tinkering the next few days will change that opinion..we'll see.
Battery life needs a few days to really get a break in for me to give an honest answer on whether it's yay or nay...
Not liking blink feed or sense 5 to much, nova may need to get downloaded faster then I thought...lol
That's it for now...Time for a nap.