Siri sounds better and worse at the same time... Ask her to "Shuffle all music" and listen to the way she pronounces "shuffled".
Having a problem with texts not delivering through iMessage. Happned once or twice initially, but it's now becoming an annoyance. Message sending hangs, reboot is the only thing that seems to resolve it.
Noticing lots of what I'll call display glitches; i.e. the image on the display becomes distorted or jumbled when transitioning from landscape to portrait, and sometimes when I hit the home key, the flyby animation of the icons goes funky, almost like an old TV with a horizontal hold issue. I suppose the problem could be with the display hardware in my 4s, but I wasn't having any problems like this with iOS6.
7.0.3 is out today. Apparently addresses both the iMessage bug and the Siri voice quality issues I've been running into.