The Good
Battery life is as good as people have claimed “After dicking around with the phone pretty much all day, my battery went from 100% to 65%. I left it overnight and I’m now at 62% battery.” The screen performs much better in direct sunlight “I tried out the screen in direct sunlight. Obviously it doesn't work if you stare right at the reflection of the sun, but turn the phone a bit so you no longer see the reflection and webpages, email, everything is very readable.” The camera looks amazing “Camera is legit. This was taken as my girlfriends dog was running towards me.”
TouchWiz is much improved
“Touchwiz has taken a big step in the right direction, although it isn't perfect yet.” Later on in the AMA, LamboSamba stated that TouchWiz was “very smooth so far”.
It is very fast
“It is fast. Repeated ookla tests show that it's currently the fastest device in my house, even beating out my wired desktop.”
The Bad
Fingerprint scanner can be spotty “Fingerprint scanner needs some work. I registered 3 of my fingers and it takes a couple swipes sometimes for the phone to like your swiping method.” No Download Booster on AT&T, Verizon, and Sprint “It's AT&T, so Download Booster isn't there. This isn't a big deal since the Wifi is fast enough” 