I got my phone last week (2GB model directly from Asus). Here are some initial thoughts and experiences:
1) When I first turned it on TalkBack mode was on by default. Quite annoying, but I got through it.
2) Battery life. I am not a huge cell phone user, even though it is my job, and the battery so far seems to get me about two days on a full charge.
3) Updates. It needed to do about 1GB of updates right out of the box, no problem.
4) Responsiveness. It works great. Fast smooth switching between screens. Videos and everything run without a glitch.
5) Audio quality. In call it seems great.I can clearly hear others they can clearly hear me. Sounds like a normal telephone. The speakerphone, well, the speaker in general seems like it could be a bit louder but it works fine.
5) Camera, here are some photos:
With Flash
Low light mode
Full auto (I could have done a better job holding it still)