Since this is kind of the unofficial OT (more activity here) I'll post after a week with the phone:
Battery life: Amazing, don't even worry about a charge like I did and I played some games, read the internet, texted, a couple calls, etc ... not 'heavy' use but average day for me and it was at 65%. This also included a ton of pics and video at the dog park with my new puppy!
Screen: Love it, I come from an iphone 4S and still have a Galaxy S3 for work. Simply great. I have a little yellow banding I think but honestly, I can't tell. It's very reactive, don't notice the delay as others have with the Home button or swiping/moving. I'm not really a fast typer so texting I don't know if it's terrible or not, I've had no issues (or rather, same issues I always have with my big fat fingers).
I did get one of those Ozry tempered glass covers, and it actually makes it feel even more 'solid' if that even makes sense. Kind of like a bed with a good heavy blanket compared to a hotel blanket.
Build: Solid. It's sleek, it's big, and the back feels so awesome that I'm sad I use a case for it. There are better reviews out there regarding this as I don't have a very long history with smartphones. iPhone 3G, Galaxy S2, S3, Infuse, iPhone 4S, Moto G are the ones I use(d) and have had a lot of contact with.
I got the 64Gb version so $350+20 shipping is encroaching on $400 so the savings, while definitely there isn't as much as the $299. But with no SD Card slot (big bummer) I opted for the larger for future proofing since I plan to have this for a few years.
OS: OMG ... so glad to be off the iOS slow-morphine drip. This thing is QUICK (but again, comparing to iPhone 4S isn't really fair) and it's definitely beefier than my S3.
Not having all the bloatware and actually being able to customize a ton of shit without rooting is great. Almost every single thing you can change and you don't have to root. You can, but you won't have to. I actually use the buttons at the bottom that a lot of people say they turned off in favor of the on screen buttons but I like the real estate!
Call Quality: Not much to say here, haven't really tested the limits but works great on TMo so far, don't notice any 'quiet' calls or anything. LTE is fast as shit when it's available. I went to the beach this weekend and had no signal through the mountains (very few phones over the years I've taken this route do) but once on the coastline had text/phone, data was nill though ... only in certain spots. I blame TMo over the phone though, my family I was visiting had data (ATT/Verizon).
Nothing but good things to say honestly, charges fast, keeps it for a while, battery lasts!! Oh man, having a big huge screen AND a battery that keeps up ... /tear