stability is if you had any crashes fc's or strange behaviour?
battery i dont want the "if" answer i want your usage battery status meaning i had 1 hour calls listen to music 2hours browse the web 1 hour mails and sms and had 20% left ?
1)laggy stock laucher
2)speed taken from drawing 1080
is the screen bright in a sunshine day i live in Greece and we got lots of sunshine!!!
++have you overclocked it
The battery question always "bothers" me, whatever experiance I might have, could be a complete different for somebody else
http://colonelzap.blogspot.de/2013/03/how-is-battery-life-of-the.html
But let me try to give a SMALL idea (see attachment). Most of the time the phone was just on standby. I did some benchmark tests, spend some time on facebook (maybe one hour?), did a little Whatsapp, one phone call to check my sim card's balance, that's pretty much what happend in these 19 hours.
The screen is very bright, still "readable" in the German sunlight and no, no overclocking.