Using my wife's mega today I saw no difference in performance between it and my note 2. She asked me why I didn't just get one for myself and had to explain about the spen functions and related functionality that i use daily that I would miss with the mega.
She had 6 hours screen on time with 11% battery left with 19 hours total time on her first charge. That is with Facebook going off with notifications about every minute it seemed like.
All in all, the Mega is a decent phone.
Sent from my SGH-I317 using XDA Premium 4 mobile app
Coming from a Galaxy far, far away!