I have another...
If you're charging the phone while turned off and then you turn it on, it won't keep charging until you disconect and reconnect the cable.... isn't very serious problem, but pretty annoying
EDIT: sorry, only happens when commin...
For whatever reason the sound enhancements doesn't work for me, none of them... i can turn them on and everything, but they don't do anything, i've tried with all of them (default one, clearaudio+, beats, musicfx, both v4a)
Apart from that, it ...
A very useful trick is to use 2g when you don't need 3g, it saves one hell of energy..
Just check if the bootloader is unlockable, there isn't much else to test
My favourite one is Holo Launcher, it runs pretty good, and it's not horrible :P
But, if you don't like the ICS/JB look, i'll recommend the Xperia S launcher.