Jelly Bean couldn't come any sooner
- I'm getting a lot of dropped WiFi signals with >80% signal strength. WTF?
- Also, packet data is VERY slow. Even on H+, I cannot load a simply mobile webpage. WTF?
- Volume is abysmal. No, I'm not deaf.
- Camera fails to focus in dark places.

<- Konon Sony, but a Galaxy SIII is much much better here.
- The Walkman app which FC every time, and the album art comes out wrong

- Battery life is pretty, average at best.
- Although is has the same 1GB RAM as the SIII, but multitasking on the SIII seems much better. No, nothing to do with the Exynos proc vs our Krait. Our kernel does not seem that well optimized for it. Yet.
On the bright side, these are what I can appreciate
- The size, weight and feel. It just feels nice to hold in the hand, not as stupidly light as the SIII, which also feels so damn plasticky.
- Awesome screen. Sorry
AmeiN 
Colors comes out better than those over-saturated Super AMOLED ones.
- Good media sharing integration. Yes, Sony nailed this one better than the crappy SIII's Allcast Play. Or was it Allcast Share? Whatever it's called, it's not as intuitive as Sony's one. Heck, Samsung requires me to REGISTER an account to use their software. WTF?
- Decent wifi strength. Still can get signal and browse internet with fair (no bars) signal.
- Lighted up XPERIA wording. This is just cool

- Voice calls are loud and clear. No complaints there.
Thankfully most of my complaints are software based, so with time, I do hope that it gets better.